单项选择题

Router R1 learns two routes with BGP for prefix 200.1.0……

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.

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单项选择题Router R1 learns two routes with BGP for prefix 200.1.0.0 16. Comparing the two routes, route 1 has a longer AS_Path Length, bigger MED, bigger Weight, and smaller Loca l PreferencE. Which of the following is true about Router R1s choice of best path for this prefix?（）

单项选择题An engineer is preparing an implementation plan in which the configuration needs to influence BGPs choice of best path. Which of the following is least likely to be used by the configuration in this imple mentation plan?（）

A. Weight
B. Origin code
C. AS_Path
D. Local_Pref

多项选择题Which of the following commands causes a router to bring down BGP neighbor relationships?（）

A. clear ip bgp *
B. clear ip bgp 1.1.1.1
C. clear ip bgp * soft
D. clear ip bgp 1.1.1.1 out

多项选择题Which of the following three BGP filtering methods enabled with the neighbor command will filter BGP prefixes based on the prefix and prefix length？（）

A. A neighbor distribute - list out command, referencing a standard ACL
B. A neighbor prefix - list out command
C. A neighbor filter - list out command
D. A neighbor distribute - list out command, referencing an extended ACL
E. A neighbor route - map out command

单项选择题R1 is currently advertising prefixes 1.0.0.0 8, 2.0.0.0 8, and 3.0.0.0 8 over its eBGP connection to neighbor 2.2.2.2 (R2). An engineer configures a prefix list (fred) on R1 that permits only 2.0.0.0 8 and then enables the filter with the neighbor R2 prefix- list fred out command. Upon exiting configuration mode, the engineer uses some show commands on R1, but no other commands. Which of the following is true in this case?（）

A. The show ip bgp neighbor 2 .2.2.2 received -routes command lists the three original prefixes.
B. The show ip bgp neighbor 2.2.2.2 advertised - routes command lists the three original prefixes.
C. The show ip bgp neighbor 2.2.2.2 routes command lists the three original prefixes.
D. T he show ip bgp neighbor 2.2.2.2 routes command lists only 2.0.0.0/8.
E. The show ip bgp neighbor 2.2.2.2 advertised - routes command lists only 2.0.0.0/8.