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单选题
Which message is used to transport routing information between BGP peers?（）
A
Open
B
Active
C
Update
D
Keepalive
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Which statem ent is true about EBGP?()
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Once the TCP connection is established, which message type initiates the BGP peering process?（）A、OpenB、ActiveC、UpdateD、Notification
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When implementing BGP confederations, which configuration command establishes the globally unique AS number used with external peers outside your network?（）A、bgp confederation asB、bgp confederation systemC、bgp confederation remote-asD、bgp confederation identifier
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单选题By default, routes learned via IBGP will be announced to which peers?（）A
IBGP peersB
EBGP peersC
active BGP peersD
established BGP peers
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单选题Which BGP attribute is used by BGP to prevent routing loops?（）A
AS - pathB
next - hopC
MEDD
weightE
local preferenceF
origin
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单选题By default， to which peers will a BGP router advertise routes learned from IBGP peers？（）A
all BGP peersB
all IBGP peersC
all EBGP peersD
all MBGP peers
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单选题Which BGP community is used to prevent the advertisement of the BGP prefix to other BGP peers？（）A
additiveB
noneC
no-exportD
no-advertiseE
local-as
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单选题Which description of BGP authentication is true？（）A
MD5 has been used by BGP to encrypt BGP update packets.B
BGP uses a message-digest algorithm to authenticate BGP peersC
A plain-text password authentication is an option of BGP authenticationD
EBGP peers authentication is faster than IBGP peers authenticationE
BGP uses public key and private key to authenticate BGP peers.
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单选题What is the role of route preference?（）A
It is used as a tie breaker when the same prefix is available through multiple sourcesB
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It is used to select which routing table to use for forwarding
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单选题Which statem ent is true about EBGP?（）A
An internal routing protocol can be used to reach an EBGP neighbor.B
The next hop does not change when BGP updates are exchanged between EBGP neighbors.C
EBGP requires a full mesh.D
A static route can be used to form an adjacency between neighbors.
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单选题Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer？（）A
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only prefixes received from EBGP peers and prefixes received from route reflectorsE
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all prefixes in its routing table except the prefixes received from other IBGP peers
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