单选题What is the first step in BGP route selection?()A The local router prefers the route with the shortest AS Path.B The local router verifies that it has a route to the BGP Next Hop IP address.C The local router prefers the route from the peer with the lo

题目
单选题
What is the first step in BGP route selection?()
A

The local router prefers the route with the shortest AS Path.

B

The local router verifies that it has a route to the BGP Next Hop IP address.

C

The local router prefers the route from the peer with the lowest peer ID address.

D

The local router prefers the route learned from an EBGP peer over a route learned from an IBGP peer.

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相似问题和答案

第1题:

Which BGP command provides the router ID, local preference, next hop, and BGP path in its output?()

A. show ip route bgp

B. show ip bgp

C. show ip bgp neighbors

D. show ip bgp summary


参考答案:B

第2题:

A problem was reported that the 10.10.10.0/24 prefix was not injected into the local BGP table on a PassGuide router named PG1.The following information is available from this router:PG1 Configuration:router bgp 65001network 10.0.0.0neighbor 172.16.1.1 remote-as65002no auto-summaryRouting table information:show ip route|include 10O10.10.10.0/24[110/11]via192.168.1.1,2d00h,Ethernet0/0Why is this prefix not in the local BGP table of thePG1()

A.The 172.16.1.1 neighbor is down.

B.The prefix 10.10.10.0/24is not a’connected’route.

C.This route is not a BGP learned route.

D.The network command is wrong.

E.None of the other alternatives apply


参考答案:D

第3题:

The following line of output was gathered on Enterprise Router Ent1 using the command show ip route. Which of the following answers is most likely to be true, based on thi s output?()B 128.107.0.0 [20/10] via 11.11.11.11, 00:02:18

A. This router has set the Weight of this route to 10.

B. This router‘s BGP table lists this route as an iBGP route.

C. This router‘s MED has been set to 10.

D. This router‘s BGP table lists an AS_Path length of 10 for this route.


参考答案:C

第4题:

Router R1 learns two routes with BGP for prefix 200.1.0.0/16. Comparing the two routes, route 1 has a shorter AS_Path Length, smaller MED, the same Weight, and smaller Local PreferencE. Which of the following is true about Router R1's choice of best path for this prefix?()

  • A、Route 1 is the best route.
  • B、Route 2 is the best route.
  • C、The routes tie as best, but one will be picked to be placed in the routing table based on tiebreakers .
  • D、Neither route is considered best.

正确答案:B

第5题:

What is the most likely reason that an IBGP route that has been selected as a best route is not entered into the IP routing table?()

  • A、Route reflectors are not passing updates properly.
  • B、BGP synchronization has been enabled.
  • C、The next-hop address is unreachable.
  • D、No loopback interface has been configured on a router.

正确答案:B

第6题:

A router has two paths to reach another network in a different autonomous system. Neither route was generated by the local router and both routes have the same default weight an d local preference values.Which statement is true about how BGP would select the best path?()

A. To influence one route to be preferred, its default local preference value will be changed via the use of the command bgp default local - preference 50

B. Th e router will prefer the shortest autonomous system path

C. If the command bgp always - compare - med has been given, then the router will prefer the route with the highest MED

D. The router will prefer the route with the lower MED


参考答案:B

第7题:

A router receives information about network 192.168.10.0/24 from multiple sources. What will the router consider the most reliable information about the path to that network()。

A.a directly connected interface with an address of 192.168.10.254/24

B.a static route to network 192.168.10.0/24

C.a RIP update for network 192.168.10.0/24

D.an OSPF update for network 192.168.0.0/16

E.a default route with a next hop address of 192.168.10.1

F.a static route to network 192.168.10.0/24 with a local serial interface configured as the next hop


参考答案:A

第8题:

A router is running BGP and receives more than one route for a particular prefix. Assume all the routes for this prefix have the same attributes.Which three path features would be reasons be for the rou ter to ignore some of the routes and not consider them as candidates for the best path?()

A. paths from an internal BGP (iBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH

B. paths for which the NEXT_HOP is inaccess ible

C. paths from an external BGP (eBGP) neighbor if the local autonomous system (AS) appears in the AS_PATH

D. paths for which the NEXT_HOP is accessible

E. paths that are marked as synchronized in the show ip bgp output

F. paths that are marked as not synchronized in the show ip bgp output


参考答案:B, C, F

第9题:

Which BGP command provides the router ID, local preference, next hop, and BGP path in its output?()

  • A、show ip route bgp
  • B、show ip bgp
  • C、show ip bgp neighbors
  • D、show ip bgp summary

正确答案:B

第10题:

In BGP routing,what does the rule of synchronization mean?()

  • A、A BGP router can only advertise an EBGP learned route,provided that the route is an IGP route in the routing table.
  • B、A BGP router can only advertise an IBGP learned route,provided that the route is an IGP route in the routing table.
  • C、A BGP router can only advertise an IBGP learned route,provided that the route is an IGP route that is not in the routing table.
  • D、A BGP router can only advertise an EBGP learned route,provided that the route is a metric of 0 in the BGP table.

正确答案:B

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