CCNA系列认证章节练习(2019.12.01)

A. ipv6 host
B. ipv6 unicast-routing
C. ipv6 local
D. ipv6 neighbor

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.

A.16
B.2
C.unlimited
D.4

A. Switch(config-if)# vlan all
B. Switch(config-if)# switchport trunk encapsulation dot1q
C. Switch(config-if)# switchport access vlan all
D. Switch(config-if)# switchport mode trunk
E. Switch(config-if)# switchport access vlan 303

A.所有的路由器会参照自己的拓扑数据库，看它们是否有到192.168.1.0的备份路由。
B.R2和R3会标记到192.168.1.0的路由为不可用，并且不会从R1接受更新直到它们的抑制定时器超时
C.由于水平分割原则，R2不会向R1发送关于去往192.168.1.0网段的错误信息
D.当R2从R1那里学到192.168.1.0网段不可达时，R2把去往192.168.1.0网段的度量值设置为无限大，并向R1发送回应消息。
E.R1将会发送LSA给R2和R3通知它们网络的变化情况，然后所有的路由器周期性的递增的发送更新直到网络收敛。

A.分组层
B.数据链路层
C.物理层
D.传输层
E.网络层

A.access-list 50 deny 192.168.1.1 0.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq 22
D.access-list 101 deny tcp any host 192.168.1.1

A.A级5没有设置口令
B.该VTY口令丢失
C.控制台密码丢失
D.一个ACL阻止Telnet访问

A.It converges quickly.
B.OSPF is a classful routing protocol.
C.It uses cost to determine the best route.
D.It uses the DUAL algorithm to determine the best route.
E.OSPF routers send the complete routing table to all directly attached routers.
F.OSPF routers discover neighbors before exchanging routing information.

A.level 0
B.level 1
C.level 4
D.level 7