As shown in the following topology, EBGP runs between AS100, AS200, AS300, and per relationships have been established between them. When As400 receives a BGP route to the network segment 1.1.1.1/32 from AS100, which of the following is the correct value of the AS_path attribute?

• A.300,200,100
• B.400,300,200,100
• C.10,200,300
• D.100,200,300,400 $

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Two community filters are configured as follows:
ip community-filter 1 permit 100:1 200:1
ip community-filter 2 permit 100:1
ip community-filter 2 permit 200:1
Which of the following statements regarding the community filters are true?

• A.A BGP route matches community-filter 2 only when it carries the Community attribute value of 100:1 or 200:1, or both.
• B.A BGP route matches community-filter 2 only when it carries the Community attribute values of 100:1 and 200:1.
• C.A BGP route matches community-filter 1 only when it carries the Community attribute values of 100:1 and 200:1.
• D.A BGP route matches community-filter 1 only when it carries the Community attribute value of 100:1 or 200:1, or both.

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Which of the following statements regarding optimal route selection of various protocols is true?

• A.BGP routes with unreachable next hops are also added to the IP routing table
• B.All routes learned through OSPF in the LSDB are added to the IP routing table
• C.The optimal route is selected after comparison between preferences of routes that are learned through BGP and OSPF and that are destined for the same network segment
• D.The optimal route is selected after comparison costs of routes that are learned through BGP and destined for the same network segment

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Router HW1 runs BGP, and has IBGP peers and EBGP peers configured.
Which of the following statements regarding the IBGP peers and EBGP peers are true?

• A.The router sends BGP updates learned from each EBGP peer to the other EBGP and IBGP peers.
• B.The IBGP peers must be directly connected. Otherwise, multi-hop IBGP must be configured on the router.
• C.The EBGP peers must be directly connected. Otherwise, multi-hop EBGP must be configured on the router.
• D.The EBGP peers can establish peer relationships through loopback interfaces.
• E.The router sends BGP updates learned from each IBGP peer to the other IBGP and EBGP peers.

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Assuming three routers (A, B, and C) uses BGP as the routing protocol. A sends Update packets to B and B sends the Update packets to
C. Which of the following attributes meet the following two conditions?
(1) A can select whether to carry this attribute in Update packets.
(2) If B receives an Update packet carrying this attribute, B still advertises the Update packet to C although B cannot identify this attribute. Then, Router C may identify and use this attribute.

• A.Multi_Exit_Disc
• B.Community
• C.Local_Pref
• D.Aggregator

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