PPP工作在OSI的哪一层（）

A.物理层

B.数据链路层

C.网络层

D.传输层

请参见图示所有路由器都运行RIPv1 10.1.1.0/29和10.1.1.16/29这两个网络无法互相访问此问题的原因可能是什么()

A.因为RIPv1是无类协议，不支持该访问

B.RIPv1不支持不连续网络

C.RIPv1不支持负载均衡

D.RIPv1不支持自动总结

Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?

A. Designated ports.

B. Duplex operating mode.

C. Fast mode ports.

D. Root bridge.

E. Root ports.

F. BDPU priority.

哪个命令能为下图中R1上配置正确的静态默认路由()

A.R1(config-if)iproute 0.0.0.0 0.0.0.0 s0/0/0

B.R1(config)iproute 0.0.0.0 0.0.0.0 s0/1/0

C.R1(config)iproute 0.0.0.0 0.0.0.0 192.168.12.1

D.R1(config)iproute 0.0.0.0 0.0.0.0 192.168.12.2

当使用下列命令配置了路由器后，将有多少地址可用于进行动态NAT转换()

A.7

B.8

C.9

D.10

A.确保端口从正确的上游交换机那里收到了BPDU

B.禁止端口接收来自上游交换机的BPDU，而只接收来自根交换机的BPDU

C.可在启用了BPDU防护的端口上使用PortFast，在端口收到BPDU时将其关闭

D.在端口收到BPDU时将其关闭

89.56.178和下列PC（）属于同一子网。

A.210.89.56.173/28

B.210.89.56.190/28

C.210.89.56.165/28

D.210.89.56.130/28

在OSPF的DR/BDR选举过程中，在路由器有相同的接口优先级情况下，什么用于确定DR或BDR（）

A.最高的OSPF进程ID

B.最低的接口IP地址

C.最低的接口开销

D.路由器ID

请选出交换机处理帧的三种模式：()

A.直通模式

B.存储转发模式

C.侦测模式

D.分段模式

E.阻塞模式

Both bridges are switches are being used throughout the Ezonexam LAN. Which of the following statements are true regarding bridges and switches in this network?

(Choose 3)

A. Switches are primarily software based while bridges are hardware based.

B. Switches usually have a higher number of ports than most bridges.

C. Bridges are frequently faster than switches.

D. Bridges define broadcast domains while switches define collision domains.

E. Both bridges and switches forward Layer 2 broadcasts.

F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

下列哪些内部路由协议支持VLSM（）

A.RIP-1

B.RIP-2

C.EIGRP

D.OSPF

E.IS-IS