A company uses Routers R1 and R2 to connect to ISP1 and ISP2, respectively, with Routers I1 and I2 used at th e ISPs. R1 peers with I1 and R2; R2 peers with I2 and R1. R1 and R2 do not share a common subnet, relying on other routers internal to the Enterprise for IP connectivity between the two routers.
Which of the following could be used to prevent potential routing loops in this design?（）

单项选择题A company uses Routers R1 and R2 to connect to ISP1 and ISP2, respectively, with Routers I1 and I2 used at the ISPs. R1 peers with I1 and R2; R2 peers with I2 and R1. Assuming as many default s ettings as possible are used on all four routers, which of the following is true about the next - hop IP address for routes R1 learns over its iBGP connection to R2?（）

A. The next hop is I2's BGP RID
B. The next hop is I2's IP address used on the R2 - I2 neigh bor relationship
C. The next hop is R2's BGP RID
D. The next hop is R2's IP address used on the R1 - R2 neighbor relationship

多项选择题The following output on Router R1 lists details of a BGP route for 190.1.0.0 16. Which of the following is true based on this output?（） R1# show ip bgp 190.1.0.0 16 BGP routing table entry for 190.1.0.0 16, version 121 Paths: (1 available, best #1, table Default - IP - Routing - Table) Advertised to update - groups: 1 1 2 3 4 1.1.1.1 from 2.2.2.2 (3.3.3.3) Origin IGP, metric 0, localpref 100, valid, internal, best

A. R1 has a neighbor 1.1.1.1 command configured.
B. R1 has a neighbor 2.2.2.2 command configured.
C. The show ip bgp command lists a line for 190.1.0.0/16 with both a n > and an i on the left.
D. R1 is in ASN 1.

单项选择题The following output occurred as a result of the show ip bgp command on Router R1. The output shows all BGP table entries on R1. How many iBGP - learned routes exist on this router?（） *>i181.0.0.0 8 10.100.1.1 0 100 0 1 2 111 112 i *>i182.0.0.0 8 10.100.1.1 0 100 0 1 2 2 22 i *>i183.0.0.0 8 10.100.1.1 0 100 0 1 2 i *>i184.0.0.0 8 10.100.1.1 0 100 0 1 2 i *> 192.135.250.0 28 192.168.1.6 0 3 4 i

A. 1
B. 2
C. 3
D. 4
E. 5

单项选择题R1 in ASN 1 with loopback1 address 1.1.1.1 needs to be configured with an iBGP connection to R2 with loopback2 IP address 2.2.2.2. The connection should use the loopbacks. Which o f the following commands is required on R1?（）

A. neighbor 1.1.1.1 remote- as 1
B. neighbor 2.2.2.2 remote- as 2
C. neighbor 2.2.2.2 update - source loopback1
D. neighbor 2.2.2.2 ibgp -multihop 2
E. neighbor 2.2.2.2 ibgp - mode

单项选择题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 R1s 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.