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CCNA 640-607 Practice Exam Five
Which of the following are true regarding ISDN (Integrated
Services Digital Network)? Choose two.
A. ISDN normally runs by means of a microwave network.
B. ISDN will only permit voice and graphics to be transmitted.
C. ISDN involves the digitization of the telephone network,
which allows source material such as voice, data, video, and
graphics to be transmitted over existing telephone wires.
D. ISDN components include terminal adapters (TA), terminals,
line termination equipment, network termination devices, and
exchange termination equipment.
Answer: C and D
ISDN involves the digitization of the telephone network, which allows
source material such as voice, data, video, and graphics to be
transmitted over existing telephone wires. ISDN components include
terminal adapters (TA), terminals, line termination equipment, network
termination devices, and exchange termination equipment.
What are the two types of ISDN (Integrated Services Digital
Network) terminals? Choose two.
A. TE1
B. SE1
C. SE2
D. TE2
Answer: A and D
TE1 (Terminal Equipment Type 1) are terminals that are ISDN
compliant. TE2 (Terminal Equipment Type 2) are terminals that
predate the ISDN standards and are non-ISDN compliant.
What are the two types of ISDN (Integrated Services Digital
Network) Network Termination devices? Choose two.
A. WT1
B. NT2
C. WT0
D. NT1
Answer: B and D
NT1 (Network Termination Type 1) devices implement ISDN
physical layer functions and connect user devices to the ISDN
facility.
NT2 (Network Termination Type 2) devices perform concentration
services and implement Data Link layer and Network layer
protocol functions.
Which of the following are ISDN (Integrated Services Digital
Network) reference points? Choose four.
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A. W
B. R
C. S
D. T
E. U
F. V
Answer: B, C, D, and E
R is the reference point between non-ISDN equipment and a
Terminal Adapter (TA).
S is the reference point between user terminals and the NT2.
T is the reference point between NT1 and NT2 devices.
U is the reference point between NT1 devices and line terminating
equipment in the carrier network.
The ISDN (Integrated Services Digital Network) BRI (Basic Rate
Interface) consists of which of the following?
A. one B channel and one D channel
B. two B channels and one D channel
C. three B channels and two D channels
D. two D channels and one B channel
Answer: B
The ISDN (Integrated Services Digital Network) BRI (Basic Rate
Interface) consists of two B channels and one D channel. The B
channels operate at 64 Kbps each and the D channel operates at
16 Kbps.
The ISDN (Integrated Services Digital Network) PRI (Primary
Rate Interface) consists of which of the following? Choose two.
A. one B channel and one D channel
B. three B channels and two D channels
C. two D channels and one B channel
D. 23 B channels and one D channel in North America and Japan
E. 30 B channels and one D channel in Europe, Australia, and
other parts of the world.
Answer: D and E
The ISDN (Integrated Services Digital Network) PRI (Primary
Rate Interface) consists of 23 B channels and one D channel in
North America and Japan or 30 B channels and one D channel in
Europe, Australia, and other parts of the world.
What are the three main components of PPP (Point-to-Point
Protocol)?
A. HDLC
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B. PAP
C. LCP
D. NCP
Answer: A, C, and D
The three main components of PPP (Point-to-Point Protocol) are HDLC
(High-Level Data-Link Control), LCP (Link Control Protocol), and NCP
(Network Control Protocol). HDLC is used for encapsulating datagrams
over point-to-point links. LCP establishes, configures, maintains, and
terminates the point-to-point connection. NCP establishes and
configures different network-layer protocols.
Which of the following are true regarding Multilink PPP
(MPPP)? Choose two.
A. Provides frame detection at the Data Link layer
B. Adds support for channel aggregation to PPP
C. Has become a popular replacement for X.25D. Ensures that packets arrive in order at the receiving device
Answer: B and D
Multilink PPP (MPPP) adds support for channel aggregation to
PPP. It ensures that packets arrive in order at the receiving
device.
Which of the following are true regarding Multichassis MPPP?
Choose three.
A. It is a Cisco Systems IOS enhancement to MPPP
B. It helps configure various network protocols
C. It helps track the frequency of network outages
D. It allows WAN administrators to group multiple access
servers into a single stack group
E. It makes use of the Stack Group Bidding Protocol (SGBP)
Answer: A, D, and E
Multichassis MPPP is a Cisco Systems IOS enhancement to MPPP.
It allows channel aggregation across multiple remote-access
servers at a central site. It allows WAN administrators to
group multiple access servers into a single stack group and
makes use of the Stack Group Bidding Protocol (SGBP).
What two types of authentication does PPP support?
A. ISDN
B. PAP
C. NCP
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D. CHAP
Answer: B and D
The two types of authentication that PPP supports are PAP (Password
Authentication Protocol) and CHAP (Challenge Handshake Authentication
Protocol). CHAP is more secure than PAP and is recommended. With PAP, a
users password is sent as clear text. CHAP uses a three-way handshake
protocol.
IBM developed SDLC (Synchronous Data-Link Control) protocol in
the mid-1970s for use in what environment?
A. Token Ring
B. Ethernet
C. ATM
D. SNA
Answer: D
IBM developed SDLC (Synchronous Data-Link Control) protocol in
the mid-1970s for use in SNA (Systems Network Architecture)
environments. It was the first link-layer protocol based on
synchronous, bit-oriented operation.
Which of the following is true regarding SDLC (Synchronous
Data-Link Control)? Choose two.
A. The International Organization for Standardization (ISO)
modified SDLC to create HDLC (High-Level Data-Link Control)
protocol
B. The Institute of Electrical and Electronic Engineers (IEEE)
modified SDLC to create IEEE 802.2
C. SDLC can only be used with multipoint links
D. SDLC remains the primary SNA link-layer protocol for WAN
links
Answer: A and D
The International Organization for Standardization (ISO)
modified SDLC to create HDLC (High-Level Data-Link Control)
protocol and SDLC remains the primary SNA link-layer protocol
for WAN links. The Institute of Electrical and Electronic
Engineers (IEEE) modified HDLC to create IEEE 802.2. SDLC can
be used with point-to-point and multipoint links.
What two types of network nodes does SDLC (Synchronous Data-
Link Control) identify?
A. main
B. primary
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C. backup
D. secondary
Answer: B and C
SDLC identifies two types of network nodes: primary and
secondary. Primary nodes set up and tear down links and
manages links while they are operational, control the
operation of other stations called secondaries, and polls the
secondaries in a predetermined order. Secondary nodes are
controlled by primary stations. Secondaries can only send
information to the primary if permission is granted by the
primary.
In what four configurations can SDLC (Synchronous Data-Link
Control) primary and secondary nodes be connected?
A. Loop
B. Point-to-Point
C. Hub go-ahead
D. Ring
E. Multipoint
Answer: A, B, C, and E
The four configurations that SDLC (Synchronous Data-Link
Control) primary and secondary nodes can be connected are
Loop, Point-to-Point, Hub go-ahead, and Multipoint. Loop
configuration involves a loop topology with the primary
connected to the first and last secondaries. Point-to-Point
configuration involves two nodes, one primary and one
secondary. Hub go-ahead configuration involves an inbound and
outbound channel. The primary uses the outbound channel to
communicate with the secondaries and the secondaries use the
inbound channel to communicate with the primary. Multipoint
configuration involves one primary and multiple secondaries.
What are two differences between HDLC (High-Level Data-Link
Control) protocol and SDLC (Synchronous Data-Link Control)
protocol?
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A. HDLC does not support synchronous full-duplex operation but
SDLC does
B. HDLC and SDLC do not share the same frame format
C. HDLC does not support the Loop or Hub go-ahead
configurations but SDLC does
D. HDLC supports three transfer modes but SDLC only supports
one
Answer: C and D
Two differences between HDLC protocol and SDLC protocol are
that HDLC does not support the Loop or Hub go-ahead
configurations but SDLC does and HDLC supports three transfer
modes but SDLC only supports one. HDLC supports NRM (Normal
Response Mode), ARM (Asynchronous Response Mode), and ABM
(Asynchronous Balanced Mode). On the other hand, both HDLC and
SDLC support synchronous full-duplex operation and they both
share the same frame format.
What are the three general categories of X.25 devices?
A. DTE
B. DCE
C. PLP
D. PSE
Answer: A, B, and D
The three general categories of X.25 devices are DTEs (data
terminal equipment), DCEs (data circuit-terminating
equipment), and PSEs (packet switching exchanges). DTEs are
end system devices that communicate across the X.25 network.
They are normally CPE (customer premise equipment) such as
PCs, network hosts, routers, terminals, etc. DCEs are
communication devices such as modems. They provide the
interface between the DTE and the PSE. PSEs are switches that
are the bulk of the carriers network. They transfer data from
one DTE to another.
What three layers of the OSI reference model does the X.25
protocol map to?
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A. Transport
B. Network
C. Data Link
D. Physical
Answer: B, C, and D
The X.25 protocol maps the lowest three layers of the OSI
reference model. These are the Physical layer, Data Link
layer, and Network layer.
Match the following X.25 protocols, PLP and LAPB, with the OSI
reference model layers that they map to.
A. PLP Physical
B. PLP Network
C. PLP Data Link
D. LAPB Physical
E. LAPB Data LinkF. LAPB Network
Answer: B and E
The protocols typically used in X.25 are PLP (Packet-Layer Protocol)
and LAPB (Link-Access Procedure, Balanced). PLP is a network layer
protocol and LAPB is a data-link layer protocol. PLP manages packet
exchanges between DTE devices across virtual circuits. PLP operates in
five modes: call setup, data transfer, idle, call clearing, and
restarting. LAPB manages communication and packet framing between DTE
and DCE devices.
ATM (Asynchronous Transfer Mode) Switching is a:
A. connectionless oriented protocol
B. synchronous protocol
C. connection oriented, synchronous protocol
D. connection oriented, asynchronous protocol
Answer: D
ATM (Asynchronous Transfer Mode) Switching is a connection
oriented, asynchronous protocol. It is usually used when high-
speed transfer of voice, data, and video is needed.
What layers of the OSI reference model does ATM (Asynchronous
Transfer Mode) map to? Choose two.
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A. Physical
B. Data link
C. Network
D. Transport
Answer: A and B
ATM (Asynchronous Transfer Mode) maps to the Physical and Data Link
layers of the OSI reference model.
Which of the following two are ATM (Asynchronous Transfer
Mode) network interfaces?
A. ANI
B. TNI
C. UNI
D. NNI
Answer: C and D
The two primary ATM interfaces are UNI (User network
interface) and NNI (Network node interface). UNI and NNI can
be further subdivided into public or private UNIs and NNIs.
Private UNI Connects an ATM endpoint and a private ATM
switch.
Public UNI Connects an ATM endpoint or private switch to a
public ATM switch.
Private NNI Connects two ATM switches within the same
private organization.
Public NNI Connects two ATM switches within the same public
organization.
ATM supports only point-to-point connections.
A. True
B. False
Answer: B
ATM supports both point-to-point and multipoint connections.
Which of the following ATM (Asynchronous Transfer Mode)
adaptation layers is used to transfer classical IP data over
ATM?
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A. AAL1
B. AAL2
C. AAL3/4
D. AAL5
Answer: D
The following are the ATM adaptation layers:
AAL1 used for handling circuit emulation
AAL2 multiplexes short packets from multiple sources into a
Single cell
AAL3/4 designed for network service providers
AAL5 the primary AAL for data. Used to transfer classical IP
data over ATM and LAN emulation (LANE). Also known as
SEAL (Simple and Efficient Adaptation Layer)
Which of the following best describes ATM (Asynchronous
Transfer Mode)?
A. It is a token passing protocol like Token Ring but much faster.
B. It is a modem technology that used existing telephone wires
to transport high bandwidth data.
C. It is a cell-switching and multiplexing technology that
combines the benefits of circuit switching and packet
switching.
D. It is a protocol used for transporting SNA and NetBIOS
traffic over an IP network.
Answer: C
ATM is a cell-switching and multiplexing technology that combines the
benefits of circuit switching and packet switching. It is not a modem
technology that uses existing telephone wires to transport high
bandwidth data because that is ADSL (Asymmetric Digital Subscriber
Line). It is not a protocol used for transporting SNA and NetBIOS
traffic over an IP network because that is DLSw (Data-Link Switching).
An ATM (Asynchronous Transfer Mode) cell consists of 53 octets, or
bytes.
A. True
B. False
Answer: A
An ATM (Asynchronous Transfer Mode) cell consists of 53 octets, or
bytes. The first five bytes contain cell-header information and the
remaining 48 bytes contain the user data, which is also known as
"payload".
When used on fiber-optic cabling, ATM (Asynchronous Transfer
Mode) supports speeds up to OC-192 (9.952 Gbps) and beyond.
A. True
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B. False
Answer: A
When used on fiber-optic cabling, ATM (Asynchronous Transfer
Mode) supports speeds of up to OC-192 (9.952 Gbps) and beyond,
especially if technologies such as WDM (Wave Division
Multiplexing) are used. Copper cabling can support speeds at
or above T3 when used with ATM.
What are two motivating factors for using ATM (Asynchronous
Transfer Mode) as a WAN core technology?
A. ATM is a good choice for customers with limited QoS
(Quality of Service) requirements
B. ATM is a good choice for customers with decreasing
bandwidth requirements
C. ATM is a good choice for customers who want to save money
spent on monthly tariffs for WAN circuits
D. ATM is a good choice for customers who need very large
bandwidth requirements
Answer: C and D
One motivating factor for using ATM (Asynchronous Transfer
Mode) as a WAN core technology is saving money spent on
monthly tariffs for WAN circuits. Customers can often have
fewer WAN links with ATM than with older technologies such as
leased lines or TDM (Time Division Multiplexing). Another
motivating factor is that ATM can support very high bandwidth.
When used on fiber-optic cabling, ATM (Asynchronous Transfer
Mode) supports speeds of up to OC-192 (9.952 Gbps) and beyond,
especially if technologies such as WDM (Wave Division
Multiplexing) are used. Copper cabling can support speeds at
or above T3 when used with ATM.
What are two purposes of a LAN switch?
A. It initiates circuit establishment
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B. It provides much higher port density at a lower cost than
traditional bridges
C. It breaks up collision domains and increases the available
bandwidth per user
D. It breaks up broadcast domains
Answer: B and C
A LAN switch provides much higher port density at a lower cost
than traditional bridges. It breaks up collision domains and
increases the available bandwidth per user. Using LAN switches
allows you to microsegment (fewer users per segment). By
microsegmenting, each user receives instant access to the full
bandwidth and does not have to contend for available bandwidth
with other users.
What are two common switching/forwarding methods used by LAN
switches?
A. Multiple forwarding
B. Cut-through
C. Redundant
D. Store-and-froward
Answer: B and D
Cut-through and store-and-forward are two common
switching/forwarding methods used by LAN switches. Cut-through
switching copies only the destination address into the LAN
switches onboard buffers before it forwards the frame to its
destination. It has the lowest latency of these two methods.
Store-and-forward switching copies the entire frame onto the
onboard buffers and computes a CRC (cyclic redundancy check)
before it forwards the frame to its destination. Latency
depends on the size of the frame.
An ATM switch forwards frames.
A. True
B. False
Answer: B
An ATM switch forwards cells whereas a LAN switch forwards frames. ALAN switch is sometimes called a frame switch and an ATM switch is
sometimes called a cell switch.
LAN switches can be categorized according to the OSI layer at
which they forward and filter frames or switch frames. What
are these three categories?
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A. Layer 2
B. Layer 3
C. Layer 2 with Layer 3 features
D. Multi-layer
Answer: A, C, and D
The three categories that switches can be placed into
according to the OSI layer at which they forward and filter
frames or switch frames are Layer 2, Layer 2 with Layer 3
features, and Multi-layer. A Layer 2 LAN switch performs
switching and filtering based on the Data-link layer MAC
address. A Layer 2 LAN switch with Layer 3 features can make
switching decisions based on more information other than the
Layer 2 MAC address such as Layer 3 traffic control features.
A Multi-layer switch makes switching and filtering decisions
based on Layer 2 and Layer 3 addresses.
Transparent bridges implement the spanning-tree algorithm
(SPA) to prevent bridging loops.
A. True
B. False
Answer: A
Transparent bridges and switches implement the spanning-tree
algorithm (SPA) to prevent loops. SPA was developed by Digital
Equipment Corporation.
Some switches have the capability to automatically move from
cut-through switching mode to store-and-forward switching
mode. This type of switching is called:
A. Cut-through-forward switching
B. Store-and-forward-cut switching
C. Forward-cut switching
D. Adaptive cut-through switching
Answer: D
A problem with cut-through switching is that it forwards
frames with CRC errors and illegal frames such as runts. Cut-through switching should not be used on a network that is
prone to these errors and illegal frames. Some switches have
the capability to automatically move from cut-through
switching mode to store-and-forward switching mode when an
error threshold is reached. This type of switching is called
adaptive cut-through switching.
Which Cisco IOS command identifies Layer 2 errors, router
errors such as dropped or ignored packets, and broadcast
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rates.
A. show version
B. show interface
C. show buffers
D. show processes
Answer: B
The Cisco IOS router command "show interface"
will identify Layer 2 errors such as dropped packets.
Which Cisco IOS command identifies router CPU usage,
including CPU time used by processes?
A. show version
B. show interface
C. show buffers
D. show processes
Answer: D
The Cisco IOS router command "show processes" will identify router CPU
utilization.
Which Cisco IOS command checks buffer usage and buffer misses?
A. show version
B. show interface
C. show buffers
D. show processes
Answer: C
The Cisco IOS router command "show buffers" will
report on buffer utilization.
ISDN protocols that begin with "E" deal with?
A. International Telephone Numbering Plan
B. International ISDN addressing
C. Concepts, structures and terminologyD. User Network Interface (UNI)
E. LAPD
Answer: A and B
E.163 is used for International Telephone Numbering Plan and
E.164 is used for International ISDN addressing.
ISDN protocols that begin with "I" deal with?
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A. Concepts, structures and terminology
B. User Network Interfaces (UNI)
C. LAPD
D. ISDN network layer between switch and terminal
E. International ISDN addressing
Answer: A and B
I.100 series is used for concepts, structures and
terminology. I.400 Series is used for UNIs.
ISDN protocols that begin with "Q" deal with?
A. International ISDN addressing
B. Concepts, structures and terminology
C. UNIsD. LAPD
E. ISDN network layer between terminal and switch
Answer: D and E
Q.921 is used for LAPD on the D channel. Q.931 is used for
ISDN network layer between terminal and switch.
Which of the following converts BRI signals into a form used
by ISDN?
A. TE1
B. NT2
C. NT1
D. TE2
E. TA
Answer: C
TE1 is used to designate a router as a device having native
ISDN interface. NT2 is for ISDN lines at the customer sitewhich are switched using a customer switch. TE2 is used to
designate a router as a device needing a TA for BRI signals.
TA is used to convert EIA/TIA-232, V.35 signals into BRI
signals.
What are the two access options for ISDN?
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A. BRI
B. PRI
C. local telephone company
D. a long distance provider
E. DDR
Answer: A and B
BRI has two 64 kbps bearer channels plus one 16 kbps data
channel. BRI connects to an NT1. PRI is available in North
America and Japan. It has 23 bearer channels and one 64
kbps D channel. In Europe PRI has 30 B channels and one D
channel.
AppleTalk addresses consist of what three elements?
A. Network numberB. Node number
C. Socket number
D. Zone number
Answer: A, B, and C
AppleTalk addresses consist of a network number, a node
number, and a socket number. They are usually written as
decimal values separated by a period. For example, 3.2.40
means Network 3, Node 2, Socket 40. It is also sometimes
represented as 3.2, Socket 40. The Network number is 16 bits,
the Node number is 8 bits, and the Socket number is 8 bits.
An address must be statically assigned to an AppleTalk device.
A. True
B. False
Answer: B
It is not necessary to statically assign an address to an
AppleTalk device. AppleTalk nodes are assigned addressesdynamically when they first attach to a network.
Which of the following is responsible for establishing and
maintaining routing tables for AppleTalk routers?
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A. RIP
B. AURP
C. RTMP
D. ATP
Answer: C
RTMP (Routing-Table Maintenance Protocol) is a transport-layer
protocol that is responsible for establishing and maintaining
routing tables for AppleTalk routers. It is based on the
Routing-Information Protocol (RIP) and uses hop count as a
routing metric.
What are the three options available for routing in AppleTalk
networks?
A. RIP (Routing-Information Protocol)
B. RTMP (Routing-Table Maintenance Protocol)C. AURP (AppleTalk Update-Based Routing Protocol)
D. Enhanced IGRP for AppleTalk
Answer: B, C, and D
The three options available for routing in AppleTalk networks
are RTMP, AURP, and Enhanced IGRP for AppleTalk. RTMP is the
most common option because it is easy to configure and is
supported by most vendors of multi-protocol routers. To reduce
the amount of traffic caused by RTMP (an RTMP router sends its
routing table every 10 seconds using split horizon), large
enterprises have the option of using AURP or Enhanced IGRP for
AppleTalk in the core of their internetworks.
What information is needed to choose a CIR (Committed
Information Rate) for a Frame Relay network? Choose three.
A. Amount of expected interactive traffic
B. Amount of expected bandwidth regeneration
C. Amount of expected file and transfer traffic
D. Amount of expected broadcast traffic
Answer: A, C, and D
In addition to verifying interactive traffic, transfer trafficand expected broadcast traffic, you will want to consider the
Cisco IOS version of your internetworking routers. Some Cisco
IOS versions do not have the updated capability of traffic
shaping that will increase your control over the network.
The following are the four steps in establishing an X.25
virtual circuit. Place them in the correct order.
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A. The PSE (Packet Switch Exchange) passes the packet to the
next remote DCE
B. The local DCE packet binder sends packet to the closest PSE
(Packet Switch Exchange)
C. The source DTE sends packet to the local DCE
D. The remote DCE examines the packet header of destination DTE
Answer: C, B, A, and D
The correct order of the four steps used in establishing an
X.25 virtual circuit are as follows:
1.)The source DTE sends packet to the local DCE
2.)The local DCE packet binder sends packet to the closest
PSE (Packet Switch Exchange)
3.)The PSE (Packet Switch Exchange) passes the packet to the
next remote DCE
4.)The remote DCE examines the packet header of destination
DTE
The Cisco 1900 switch IOS can be configured through a menu
system and what else?
A. Set-based CLI
B. IOS-based CLI
C. Pruning system
D. VTP trunk
Answer: B
The Cisco 1900 switch IOS can be configured through a menu
system and an IOS-based CLI (Command-Line Interface).
What type of cable do you use when you connect two switches?
A. rollover cable
B. cat5 cable
C. crossover cable
D. straight-through cable
Answer: C
You should use a crossover cable when you connect two switches.
It is possible to configure a switch through the Internet.
A. True
B. False
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Answer: A
You can configure a switch through the Internet using the
Virtual Switch Manager (VSM). To do this, you have to type in
the IP address of the switch at the Web browser.
What happens when you press the mode button on the 1900 switch?
A. Nothing. The 1900 switch has no buttons, only ports
B. You see three different status lights
C. It puts you in broadcast mode
D. It puts the switch in stand-by mode
Answer: B
When you press the mode button on the 1900 switch, you see
three different status lights. It is the only button on the
1900 switch. The status lights are:
Stat shows status of the ports. Green is active, blinking
green is activity, amber means a link fault has occurred.
UTL indicates the bandwidth of the switch.
FDUP shows you which ports are configured at full duplex
If you have a console cable connected to the 1900 switch and
you power the switch up, what menu options do you see if the
IP configuration is not set? Choose three.
A. [M]
B. [S]
C. [K]
D. [I]
E. [C]
Answer: A, C, and D
If you have a console cable connected to the 1900 switch and
you power the switch up the menu options you see if the IP
configuration is not set are:
[M] Menus
[K] Command Line[I] IP Configuration
Once the IP configuration is set, the [I] selection will no
longer appear.
How many ports are available on the 1900 series switches?
Choose two.
A. 8
B. 12
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C. 16
D. 24
Answer: B and D
The 1912 switch has 12 ports and the 1924 switch has 24 ports.
These ports are 10BaseT ports. Each switch also has one or two
FastEthernet uplinks to connect to other switches. These are
either 100BaseT or 100BaseFX.
At which layers of the OSI reference model does frame relay
operate? Choose two.
A. Network
B. Data Link
C. Physical
D. Transport
Answer: B and C
Frame Relay operates at the Physical and the Data Link layers of the
OSI reference model.
What two general categories do frame relay devices fall under?
A. CSU
B. DSU
C. DTE
D. DCE
Answer: C and D
The two general categories that frame relay devices fall under are Data
Terminating Equipment (DTE) and Data Circuit-terminating Equipment
(DCE). DTEs are usually customer premise equipment (CPE) such as
terminals, PCs, routers, bridges, etc. DCEs are carrier owned
internetworking devices. DCEs provide clocking and switching services
in a network.
Which of the following are true regarding a DLCI (Data-Link Connection
Identifier)? Choose two.
A. It identifies a Frame Relay virtual circuit
B. It helps a Token Ring network identify the active monitor
C. It is usually assigned by the Frame Relay service provider
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D. It must be the same for all DTE devices on the WAN
Answer: A and C
A Frame Relay virtual circuit is identified by a DLCI (DataLink
Connection Identifier). It is usually assigned by the Frame Relay
service provider, such as a telephone company. DLCI numbers have local
significance, so two DTE devices connected by a virtual circuit may be
assigned a different DLCI number on each end of the connection. DLCI
has nothing to do with Token Ring.
Frame Relay implements two congestion notification mechanisms.
What are they?
A. DLCI
B. CSMA
C. FECN
D. BECN
Answer: C and D
The two congestion notification mechanisms implemented by Frame Relay
are FECN (Forward-explicit congestion notification) and BECN (Backward-
explicit congestion notification). Both of these are controlled by a
bit contained in the Frame Relay header. The Frame Relay header also
contains a DE (Discard Eligibility) bit that is used to identify less
important traffic that can be dropped during periods of congestion.
Which of the following are related to Frame Relay? Choose
three.
A. CIR
B. Be
C. Bc
D. BGP
Answer: A, B, and C
CIR (Committed information rate) is the rate at which a Frame
Relay network agrees to transfer information under normal
conditions averaged over a minimum increment of time. Bc
(Committed Burst) is the maximum amount of data, in bits, that
a Frame Relay network is committed to accept and transmit at
the CIR. Be (Excess Burst) is the number of bits that a FrameRelay network will attempt to transmit after Bc (Committed
Burst) is accommodated. CIR, Bc, and Be are all negotiated
tariff metrics.
Which of the following are true regarding LMI (Local
Management Interface)? Choose two.
A. The LMI is a set of enhancements to the Frame Relay
specification
B. It can be used only with an SVC (Switched Virtual Circuit)
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C. It was developed by IBM
D. It offers a number of features called extensions for
managing complex internetworks
Answer: A and D
The LMI is a set of enhancements to the Frame Relay
specification. It was developed by StrataCom, Northern
Telecom, Digital Equipment Corporation, and Cisco Systems. It
offers a number of features called extensions for managing
complex internetworks. LMI extensions include global
addressing, virtual-circuit status messages, and multicasting.
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