BGP best route 

第1题：

第2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.

第3题：

第4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.

第5题：

BGP best route selection process is based on what ？（）

• A、lowest cost
• B、highest bandwidth
• C、lowest hop-count
• D、path attributes
• E、lowest delay

第6题：

Which of the following is the primary motivation for using BGP between an Enterprise and its ISPs?（）

• A、To influence the choice of best path (best route) for at least some routes
• B、To avoid having to configure static routes
• C、To allow redistribution of BGP routes into the IGP routing protocol
• D、To monitor the size of the Internet BGP table

第7题：

What best explains the BGP route-reflector function？（）

• A、BGP route-reflector should be in forwarding path of data coming from its clients
• B、BGP route-reflector does not have to be in the forwarding path of data coming from its clients
• C、BGP route-reflector will stop reflecting the routes if they’re not directly-connected clients
• D、None of the above

第8题：

第9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.

第10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