默认题库 - CCNP(642-902)

单选题

Router R1 has eBGP connections to I1 and I 2, routers at the same ISP. The company that owns R1 can use public address range 130.1.16.0/20. The following output lists all the IP routes in R1's routing table within this rangE. Which of the following answers would cause R1 to advertise the 130.1.1 6.0/20 prefix to its eBGP peers?（） R1# show ip route 130.1.16.0 255.255.240.0 longer - prefixes ! lines omitteD... O 130.1.16.0/24 [110/3] via 10.5.1.1, 00:14:36, FastE thernet0/1 O 130.1.17.0/24 [110/3] via 10.5.1.1, 00:14:36, FastEthernet0/1 O 130.1.18.0/24 [110/3] via 10.5.1.1, 00:14:36, FastEthernet0/1

A. Configure R1 with the network 130.1.16.0 mask 255.255.240.0 command.
B. Configure R1 with the network 130.1.16 .0 mask 255.255.240.0 summaryonly command.
C. Redistribute from OSPF into BGP, filtering so that only routes in the 130.1.16.0/20 range are redistributed.
D. Redistribute from OSPF into BGP, filtering so that only routes in the 130.1.16.0/20 range are redistributed, and create a BGP summary for 130.1.16.0/20.

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单选题

IS - IS creates and maintains adjacencies and neighbor relations by using the Hello protocol. For the following options, which are Hello packets used in IS - IS?（）

A generic Hello
B. Point - to - point Level 1, point - to -point Level 2, LAN Level 1, LAN Level 2
C. Point - to - point Level 1, point - to - point Level 2, LAN
D. Point - to - point, LAN Level 1, LAN Level 2

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单选题

Which of the following is the primary motivation for using BGP between an Enterprise and its ISPs?（）

A. To influence the choice of best path (best route) for at least some routes
B. To avoid having to configure static routes
C. To allow redistribution of BGP routes into the IGP routing protocol
D. To monitor the size of the Internet BGP table

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单选题

When building an IP multicast domain using PIM which mode assumes that other routers do not want to forward multicast packets for the group?（）

A. PIM - DM
B. PIM - SM
C. PIM - RP
D. CGMP
E. IGMP snooping

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单选题

What does the command clear ipv6 ospf process accomplish?（）

A. The shortest path first (SPF) algorithm is performed on the LSA database.
B. The OSPF adjacencies are cleared and initiated again.
C. The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.
D. The route table is cleared. Then the OSPF neighbors are reformed.

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多选题

Which three are characteristics of IPv6?（）

An IPv6 address is 128 bits long.
B. An IPv6 header contains the header checksum field.
C. An IPv6 header is 20 bits long.
D. An IPv6 header contains the next header field.
E. IPv6 route rs send RA messages.
F. An IPv6 header contains the protocol field.

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多选题

What are two rules for compacting IPv6 addresses?（）

A. Every 16 - bit segment segment that consists of all zeroes can be represented with a single colon.
B. The trailing zeroes in any 16 - bit segment do not have to be written.
C. The leading zeroes in any 16 - bit segment do not have to be written.
D. Any single, continuous string of one or more 16 - bit segments that consists of all zeroes can be represented with a double colon.
E. The maximum number of times a double colon can replace a 16 - bit segment that consists of all zeroes is two.
F. Two zeroes in the middle of any 16 -bit segment do not have to be written.

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多选题

Which three conditions can cause BGP n eighbor establishment to fail?（）

A. The IBGP neighbor is not directly connected.
BGP synchronization is enabled in a transit autonomous system with fully - meshed IBGP neighbors.
C. The EBGP neighbor ebgp - multihop option is set to the de fault value.
D. The BGP update interval is different between the two BGP neighbors.
E. The BGP neighbor is referencing an incorrect autonomous system number in its neighbor statement.
F. There is an access list blocking all TCP traffic between the two BGP neighbors.

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单选题

Which command displays the IBGP and EBGP neighbors that are configured?（）

A. show ip bgp paths
B. show ip bgp peers
C. show ip bgp
D. show ip bgp summary

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单选题

Which one of the following statements about BGP is FALSE?（）

A. BGP uses TCP port 179.
BGP ensures reliability of updates by using the reliable transport services of TC
C. The network command with the mask option never insta lls a prefix into the BGP table unless there is a matching prefix exists in the IP route table.
D. A TCP connection is required before exchanging updates.
E. BGPuses notification and the update messages to establish and maintain the BGP neighbor relati onship.

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