You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)

A. There are 254 usable subnets.

B. There are 256 usable hosts per subnet.

C. There are 50 usable subnets.

D. There are 254 usable hosts per subnet.

E. There are 24 usable hosts per subnet.

F. There is one usable network.

IGP包括如下哪些协议()

A.RIP

B.BGP

C.IS-IS

D.OSPF

当配置一个CISCO的路由器时，缺省的DR和BDR优先级是（）。

A.0

B.1

C.16

D.255

A.show license

B.show license feature

C.snow license udi

D.show version

扩展ACL和标准ACL的区别（）。

A.标准的ACL在禁止和允许方面比扩展的ACL更高的精度

B.扩展的ACL核查数据包的源地址和目标地址和端口号

C.他们都可以查端口号

D.他们都可以查特殊协议和其他参数

在配置0SPF时，网络管理员使用环回接口的原因是（）

A.只有环回地址可以用作OSPF的路由器ID

B.环回接口用于设置OSPF度量

C.环回地址高于配置的路由器优先级值

D.环回接口是逻辑接口，不会失效

The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask?

A．4 networks and 64 hosts

B．64 networks and 4 hosts

C．4 networks and 62 hosts

D．62 networks and 2 hosts

E．6 network and 30 hosts

RIP协议负载均衡的路径数量为（）

A.无限制

B.最多4条

C.最多5条

D.最多6条

You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?

A．Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link

B．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

C．Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal

E．None of the above