問答題what is portfast？

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1.問答題What’s PHB？
2.單項選擇題What are the mandatory， well-known BGP attributes？（）

A.origin,AS-path,next-hop
B.AS-path,origin,MED
C.AS-path,origin,weight
D.AS-path,weight,MED

5.單項選擇題Your Cisco network currently runs OSPF and you have a need to policy-route some specific traffic， regardless of what the routing table shows. Which one of these options would enable you to policy-route the traffic？（）

A.source IP address and the protocol （such as SSL， HTTPS， SSH）
B.the packet Time to Live and the source IP address
C.type of service header and DSCP value
D.destination IP address

6.單項選擇題

Refer to the exhibit. Routers A and B are directly connected and running OSPF， but they are unable to form a neighbor relationship. What is the most likely cause？（）

A.The routers are not on the same network.
B.The network statements do not match.
C.The process number does not match.
D.The MTU does not match.
E.The OSPF cost does not match.
F.There is a physical issue with the cable.

7.多項選擇題In your Cisco EIGRP network， you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）

A.An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B.The ARP cache was cleared.
C.The counters were cleared.
D.The IP EIGRP neighbor relationship was cleared manually.

10.單項選擇題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.