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Exam 642-901 study material
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Free 642-901 Exam Preparation Questions
Exam 642-901: BSCI - Building Scalable Cisco Internetworks
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Question:1 Study the diagram and configuration in the exhibit carefully. Company2 is summarizing its networks from AS 64100 with the aggregate-address command. However, the show ip route command on Company1 reveals the Company2 individual networks as well as its summary route. Which one of the following options would ensure that only the summary route would appear in the routing table of Company1?
A. Delete the four network statements and leave only the aggregate-address statement in the BGP configuration.
B. Add the keyword summary-only to the aggregate-address command. C. Create a route map permitting only the summary address. D. Add a static route with a prefix of 192.168.24.0 255.255.252.0 pointing to the null0 interface.
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Answer: B
Question:2 Router P4SA is configured as follows:
P4SA (config)#router rip P4SA (config-router)#network 10.0.0.0 P4SA (config-router)#distribute-list 44 in interface BRI0 P4SA (config-router)#exit P4SA (config)#access-list 44 deny 172.16.1.0 0.0.0.255 P4SA (config)#access-list 44 permit any What are the results of this RIP configuration on router P4SA? (Choose two.)
A. router P4SA will not advertise the 10.0.0.0 network to router P4SD B. no routing updates will be sent from router P4SA on interface BRI0 to router P4SD C. the route to network 172.16.1.0 will not be entered into the routing table on router P4SA D. the routing table on router P4SA will be updated with the route to router P4SC
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Answer: C, D
Question:3 You work as a network engineer at Company.com, examine the exhibit carefully. During the redistribution process configured on P4SA, some EIGRP routes, such as 10.1.1.0/24 and 10.2.2.0/24, are not being redistributed into the OSPF routing domain. Which two items could be a solution to this problem? (Choose two.)
A. Configure the redistribute command under router eigrp 1 instead. B. Change the metric-type to 2 in the redistribute command. C. Add the subnets option to the redistribute command. D. Change the EIGRP AS number from 100 to 1 in the redistribute command.
Answer: C, D
Question:4 What is the difference between the configuration of a totally stubby area and that of a stub area?
A. The totally stubby area requires the no-summary command on all routers. B. The totally stubby area requires the totally stubby command on all routers. C. The no-summary command should be included on the ASBR within the totally stubby area. D. The no-summary command should be included on the ABR within the totally stubby area.
Answer: D
Question:5 Available Bit Rate (ABR) is a service used in ATM networks when source and destination don't need to be synchronized. Which IS-IS router equals to an ABR in OSPF?
A. Level 2 B. Level 0 C. Level 1 D. Level 1-2
Answer: D
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Question:6 On the basis of the exhibit below. Routers P4S1 and P4S2 have building up a neighbor relationship and are exchanging routing information. The network design requires that P4S1 receive routing updates from P4S2, but not advertise any routes to P4S2. Which configuration command sequence will successfully complete this task?
A. P4S1(config)# router eigrp 1 P4S1(config-router)# passive-interface serial 0
B. P4S2(config)# router eigrp 1 P4S2(config-router)# passive-interface serial 0
C. P4S1(config)# access-list 20 deny any P4S1(config)# router eigrp 1 P4S1(config-router)# distribute-list 20 out serial 0
D. P4S2(config)# access-list 20 deny any P4S2(config)# router eigrp 1 P4S2(config-router)# distribute-list 20 out serial 0
E. P4S1(config)# access-list 20 permit any P4S1(config)# router eigrp 1 P4S1(config-router)# distribute-list 20 in serial 0
F. P4S2(config)# access-list 20 permit any P4S2(config)# router eigrp 1 P4S2(config-router)# distribute-list 20 in serial 0
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Answer: C
Question:7 Based on the router output provided in the exhibit, which command sequence can be added to P4S1 to generate a default route into the OSPF domain?
A. ip default-gateway B. default-router C. default-information originate always D. ip default-network
Answer: C Question:8 You are a network administrator at Company.com, examine this exhibit carefully , when you configure a virtual link to connect area 2 with the backbone area, you receive this console message on P4S3:
*Mar 1 00:25:01.084: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0 How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?
A. P4S1(config-router)# area 0 virtual-link 1.1.1.1 P4S3(config-router)# area 2 virtual-link 3.3.3.3
B. P4S1(config-router)# area 1 virtual-link 30.30.30.3 P4S3(config-router)# area 1 virtual-link 20.20.20.1
C. P4S1(config-router)# area 1 virtual-link 20.20.20.2 P4S3(config-router)# area 1 virtual-link 30.30.30.2
D. P4S1(config-router)# area 1 virtual-link 3.3.3.3 P4S3(config-router)# area 1 virtual-link 1.1.1.1
Answer: D
Question:9 Look at the following exhibit. You have just configured OSPF on all routers in the network. You configure area 5 as an NSSA are a. You redistribute the RIPv2 routes into the OSPE field on router P4S-R5. Choose two types of LSAs that will be originated by router P4S-R5. (choose two)
A. type 2 Network LSA B. type 3 Network Summary LSA C. type 1 Router LSA D. type 7 NSSA External LSA
Answer: C, D
Question:10 The command bgp always-compare-med is added to a router configuration. What will be the objective of this command?
A. forces the router to compare metrics of routes from different autonomous systems B. forces the router to compare the communities of routes from different autonomous systems C. forces the router to compare the local preference of routes from different autonomous systems D. forces the router to compare the weight of routes from different autonomous systems
Answer: A
Question:11 A Company network administrator is redistributing OSPF into RIP. RIP is routing the 128.103.36.0/24 network. OSPF is routing the 128.103.35.32/28 network. Users in the RIP domain cannot arrive at devices in the OSPF domain. In order to enable RIP to advertise the routes learned from OSPF into the RIP domain ,which two tasks must be done ? (Choose two.)
A. Tune the OSPF default metrics to allow seamless redistribution into RIP. B. Redistribute configured static routes into RIP. C. Add a static route that points to the RIP domain address space with a /24 network mask and a next
hop of 128.103.36.2. D. Add a static route that points to the OSPF domain address space with a /24 network mask with a
next hop of null0.
Answer: B, D
Question:12 For the following options, which two provide intra-area routing services? (Choose two.)
A. L1/L2 IS B. L2 IS C. L1 ES D. L1 IS
Answer: A, D
Question:13 Which two statements best describe the partial configuration provided in the exhibit? (Choose two.)
A. Hosts connected to the FastEthernet0/1 interface will not receive DHCP replies from the router.
B. The first DHCP client to connect to the FastEthernet 0/0 interface will receive the IP address 10.0.0.1
C. The first DHCP client to connect to the FastEthernet 0/1 interface will receive the IP address 10.10.0.1.
D. The first DHCP client to connect to the FastEthernet 0/0 interface will receive the IP address 10.0.0.6.
Answer: A, D
Question:14 Look at the following exhibit. You have configured OSPF on all routers in the network. However, the OSPF is not working between routers P4S-R1 and P4S-R2. Based upon the debug ip ospf adj output information, what do you think is the cause of the problem?
A. The actual link between OSPF area 5 and OSPF area 0 is misconfigured. B. Only one of the routers is configured as a stub router. C. The IP address or subnet mask is misconfigured on one of the neighboring interfaces between
routers P4S-R1 and P4S-R2. D. The authentication is not correctly configured on one of the neighboring interfaces between
routers P4S-R1 and P4S-R2.
Answer: C
Question:15 You work as a network engineer at Company.com, study the exhibit carefully. Routers P4S1 and P4S2 have built up a neighbor relationship and are exchanging routing information. The network design requires that P4S1 receive routing updates from P4S2, but not advertise any routes to P4S2. Which configuration command sequence will successfully finish this task?
A. P4S2(config)# access-list 20 deny any P4S2(config)# router eigrp 1 P4S2(config-router)# distribute-list 20 out serial 0
B. P4S2(config)# router eigrp 1 P4S2(config-router)# passive-interface serial 0 C. P4S1(config)# access-list 20 deny any P4S1(config)# router eigrp 1 P4S1(config-router)#
distribute-list 20 out serial 0 D. P4S1(config)# router eigrp 1 P4S1(config-router)#
passive-interface serial 0
Answer: C
Question:16 Enhanced Interior Gateway Routing Protocol - (EIGRP) is a Cisco proprietary routing protocol loosely based on their original IGRP. In term of the exhibit. EIGRP is enabled on all routers on the network. What additional configuration is required for the routers connected over the Frame Relay multipoint interfaces to compensate for a low-speed NBMA connection?
A. Configure the EIGRP hold time on all Frame Relay interfaces to 15 seconds. B. Configure the EIGRP hello interval on all Frame Relay interfaces to 5 seconds. C. Configure the EIGRP hello interval on all Frame Relay interfaces to 60 seconds. D. Configure the bandwidth on all EIGRP Frame Relay interfaces to the lowest CIR multiplied by the
number of PVCs for the multipoint connection.
Answer: D
Question:17 In order to display the two values used in the calculation of the EIGRP metric, which show command will be used?
A. show ip eigrp neighbor B. show protocol C. show interface D. show ip eigrp interface
Answer: C
Question:18 An OSPF stub area has no external routes in it, so you cannot redistribute from another protocol into a stub are a. For the following options, which three restrictions apply to OSPF stub areas? (Choose three.)
A. No autonomous system border routers are allowed. B. No virtual links are allowed. C. Redistribution is not allowed unless the packet is changed to a type 7 packet. D. The area cannot be a backbone area.
Answer: A, B, D Question:19 Look at the following exhibit. In order to configure OSPF area 5 as a Totally Stubby area, what extra command should be used?
A. area 5 stub no-summary on routers P4S-R4 and P4S-R5 B. area 5 stub no-summary on router P4S-R4 and area 5 stub on router P4S-R5 C. area 0 stub on routers P4S-R4 and P4S-R5 D. area 5 stub on routers P4S-R4 and P4S-R5
Answer: B
Question:20 The Company company has implemented EIGRP in its network. Identify three characteristics of EIGRP feasible successors? (Choose three.)
A. If the successor becomes unavailable, then the feasible successor can be used immediately without recalculating for a lost route.
B. A feasible successor is selected by comparing the advertised distance of a non-successor route to the feasible distance of the best route.
C. If the advertised distance of the non-successor route is less than the feasible distance of best route, then that route is identified as a feasible successor.
D. The feasible successor can be found in the routing table. E. Traffic will be load balanced between feasible successors with the same advertised distance.
Answer: A, B, C
Question:21 Which three kinds are of OSPF areas? (Choose three.)
A. stub B. remote C. active D. backbone E. ordinary or standard
Answer: A, D, E
Question:22 On the basis of the show ip bgp summary output, which two descriptions are correct? (Choose two.)
A. The BGP session to the 10.1.1.1 neighbor is established. B. The BGP session to the 10.3.3.3 neighbor is established. C. The BGP session to the 10.2.2.2 neighbor is established. D. The router is attempting to establish a BGP peering session with the 10.2.2.2 neighbor.
Answer: A, D
Question:23 In order to enable BGP tunneling over an IPv4 backbone, the IPv4 address 192.168.30.1 is converted into a valid IPv6 address. Which three IPv6 addresses are acceptable formats for the IPv4 address? (Choose three.)
A. ::192.168.30.1 B. C0A8:1E01:: C. ::C0A8:1E01 D. 0:0:0:0:0:0:192.168.30.1
Answer: A, C, D
Question:24 Which three characteristics are of IPv6? (Choose three.)
A. IPv6 routers send RA messages. B. An IPv6 header is 20 bits long. C. An IPv6 address is 128 bits long. D. An IPv6 header contains the next header field.
Answer: A, C, D
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