Refer to the exhibit. The network shown in the diagram ……

多项选择题Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem?（）

A.All of the routers need to be configured for backbone Area 1.
B.R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.
C.A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.
D.The hello and dead interval timers are not set to the same values on R1 and R3.
E.EIGRP is also configured on these routers with a lower administrative distance.
F.R1 and R3 are configured in different areas.

单项选择题A network administrator is troubleshooing an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency. The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information?（）

A.Router# show ip eigrp adjacency
B.Router# show ip eigrp topology
C.Router# show ip eigrp interfaces
D.Router# show ip eigrp neighbors

单项选择题VLAN 3 is not yet configured on your switch.What happens if you set the switchport access vlan 3 commmand interface configuration mode?（）

A.The command is accepted and the respective VLAN is added to vlan dat.
B.The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.The port turns amber.

单项选择题In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?（）

A.after broken links are re-established
B.in an improperly implemented redundant topology
C.when upper-layer protocols require high reliability
D.during high traffic periods
E.when a dual ring topology is in use

多项选择题Which router IOS commands can be used to troubleshoot LAN connectivity problems?（）

A.ping
B.tracert
C.ipconfig
D.show ip route
E.winipcfg
F.show interfaces