下列对生成树协议(STP)的描述中，错误的是( )。-考呗网

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单选题下列对生成树协议(STP)的描述中，错误的是( )。

A．BridgeID用8个字节表示
B．STP运行在交换机和路由器设备上
C．由IEEE制定的最早的STP标准是IEEE 802．1D
D．阻塞的端口仍然是一个激活端口，但它只能接收BPDU

STP运行在三层交换机上，不运行在路由器上。故选择B选项。

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1下列是一台Cisco路由器的部分路由表，表中的路由信息完全正确的是( )。

A． Gateway of last resort is 202.112.41.217 to network 0.0.0.0
C 212.112.7.0/24 is directly connected,VLAN120
212.112.37.0/30 is subnetted,1 subnets
C 212.112.37.16 is directly connected,VLAN130
167.105.0.0/26 is subnetted,2subnets
S 167.105.125.128 [1/0] via 202.112.7.1
S 167.105.144.192 [1/0] via 202.112.7.1
S *0.0.0.0/0 [1/0] via 202.112.41.217
B． Gateway of last resort is 202.112.41.217 to network 0.0.0.0
C 212.112.7.0/24 is directly connected, FastEthemet 2/5
212.112.37.0/30 is subnetted,1 subnets
C 212.112.37.16 is directly connected,POS3/O
167.105.0.0/26 is subnetted,2subnets
S 167.105.125.128 [1/0] via202.112.7.1
S 167.105.144.192 [1/0] via 202.112.7.1
S*O.0.0.0/0 [1/0] via202.112.7.1
C． Gateway of last resort is 202.112.41.217 to network 0.0.0.0
C 212.112.7.0/24 is directly connected, FastEthemet 2/5
212.112.37.0/30 is subnetted,1 subnets
C 212.112.37.16 is directly connected, POS3/O
167.105.0.0/26 is subnetted,2 subnets
S 167.105.125.128 [1/0] via 202.112.7.1
S 167.105.144.192 [1/0] via 202.112.7.1
S*0.0.0.0/0 [1/0] via202.112.41.217
D． Gateway of last resort is 202.112.41.217 to net work 0.0.0.0
C 212.112.7.0/24 is directly connected, FastEthemet2/5
212.112.37.0/30 is subnetted,1 subnets
C 212.112.37.16 is directly connected,POS3/0
167.105.0.0/26 is subnetted,2 subnets
S 167.105.125.128 [20/0] via 202.112.7.1
S 167.105.144.192 [20/0] via 202.112.7.1
S * 0.0.0.0/0 [20/0] via202.112.41.217

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2在一台Cisco路由器上使用show access．1ists命令得到下列信息
Standard IP access list test
deny 10.0.0.0,wildcard bits 0.255.255.255 log
deny 192.168.0.0,wildcard bits 0.0.255.255
deny 127.0.0.0,wildcard bits 0.255.255.255
deny 172.16.0.0,wildcard bits O.15.255.255
permit any
路由器 access-lists 的正确配置是( )。

A． Router( config)#ip access-list extended test
Router(config-ext-nacl) #deny 10.0.0.00.255.255.255 log
Router(config-ext-nacl) #deny 192.168.0.00.0.255.255
Router(config-ext-nacl) #deny 127.0.0.00.255.255.255
Router(config-ext-nacl) #deny 172.16.0.00.15.255.255
Router(config-ext-nacl) #permit any
B． Router(config) #ip access-list standard test
Router(config-std-nacl) #deny 10.0.0.00.255.255.255 log
Router(config-std-nacl) #deny 192.168.0.00.0.255.255
Router(config-std-nacl) #deny 127.0.0.00.255.255.255
Router(config-std-nacl) #deny 172.16.0.00.15.255.255
Router(config-std-nacl) #permit any
C． Router( config)#ip access-list standard test
Router(config-std-nacl) #permit any
Router(config-std-nacl) #deny 10.0.0.00.255.255.255 log
Router(config-std-nacl) #deny 192.168.0.00.0.255.255
Router(config-std-nacl) #deny 127.0.0.00.255.255.255
Router(config-std-nacl) #deny 172.16.0.00.15.255.255
D． Router(config) #ip access-list standard test
Router(config-std-nacl) #deny 10.0.0.0255.0.0.0 log
Router(config-std-nacl) #deny 192.168.0.0255.255.0.0
Router(config-std-nacl) #deny 127.0.0.0255.0.0.0
Router(config-std-nacl) #deny 172.16.0.0255.240.0.0
Router(config-std-nacl) #permit any

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3在Cisco路由器上执行一条命令后得到的部分信息如下：
Using 6079 out of 32762 bytes
!
version10.2
service password-encryption
!
host name Router
enable password 7083B4057584052474B52
!
chat -scriptcisco-defaultABORTERROR" " " ATZ" OK" ATDT \T" TIMEOUT30 \ cCONN
!
interface Ethernet0
ip address 202.112.7.4255.255.255.0
ip accounting out put-packets
no mop enabled
!
在路由器上执行的命令是( )。

A． Router#show configuration
B． Router#show flash
C． Router#show ip protocols
D． Router#show ip route

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