單項選擇題You use OSPF as your network routing protocol. You use the command show ip route and you see several routes described as O，O IA，O E1，and O E2. What routes are in your area？（）

A.O IA
B.O E1
C.O E2
D.O


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2.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

3.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.

5.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.