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單項選擇題 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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1.單項選擇題 The fol lowing line of output was extracted from the output of the show ip bgp command on Router R1. Which of the following can be determined from this output?（）
Network Next Hop Metric LocPrf Weight Path
* 130.1.1.0/28 1.1.1.1 0 1 2 3 4 i

A. The route is learne d from an eBGP peer
B. The route has no more than three ASNs in the AS_PatH
C. The route is the best route for this prefix
D. None of these facts can be positively determined by this output

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2.單項選擇題 The following output occurs on Router R1. Which of the following cannot be determine d from this output?（）
R1# show ip route 180.1.1.0 255.255.255.240
Routing entry for 180.1.1.0/28
Known via "bgp 2", distance 20, metric 0
Tag 3, type external
Last update from 192.168.1.2 00:10:27 ago
Routing Descriptor Blocks:
* 192.168.1.2, from 19 2.168.1.2, 00:10:27 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 3

A. The type of BGP peer (iBGP or eBGP) that advertised this route to R1
B. R1's ASN
C. The next - hop router's ASN
D. The AS_Path length

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3.單項選擇題Which of the following answers is most true about the BGP Update message?（）

A. It lists a set of path attributes, along with a list of prefixes that use those PAs
B. It lists a prefix/length, plus the PA settings for that prefix
C. It lists withdrawn routes, but never in the same Update message as newly advertised routes
D. A single Update message lists at most a single prefix/lengtH

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4.多項選擇題 The following output was taken from the show ip bgp command on Router R2. In this case, which of the following commands are most likely to already be configured on R2?（）
BGP router identifier 11.11.11.11, local AS number 11
...
Neighbor V AS Ms gRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.1.1 4 1 87 87 0 0 0 00:00:06 Idle
(Admin)
2.2.2.2 4 3 173 183 41 0 0 00:58:47

A. router bgp 11
B. neighbor 1.1.1.1 remote- as 11
C. neighbor 2.2.2.2 prefix - limit 1
D. neighbor 1.1.1.1 shutdown

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5.單項選擇題 The following output, taken from a show ip bgp command on Router R1, lists two neighbors. In what BGP neighbor state is neighbor 1.1.1.1?（）
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.1.1 4 1 60 61 26 0 0 00:45:01
0
2.2.2.2 4 3 153 159 26 0 0 00:38:13
1

A. Idle
B. Opensent
C. Active
D. Established

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