單項選擇題201.在以太網(wǎng)中，工作站在發(fā)數(shù)據(jù)之前，要檢查網(wǎng)絡(luò)是否空閑，只有在網(wǎng)絡(luò)不阻塞時工作站才能發(fā)送數(shù)據(jù)，是采用了（）機(jī)制。

A.ip
B.tcp
C.ICMP
D.數(shù)據(jù)偵聽與沖突控制CSMA/CD


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1.單項選擇題In which solution is a router ACL used？（）

A.protecting a server frome unauthorized acces
B.controlling path selection，based on the route metric
C.reducing router CPU utilization
D.filterring packets that are passing through a router

2.單項選擇題

Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?（）

 

A.10.0.0.0
B.10.0.0.254
C.192.223.129.0
D.192.223.129.254

3.單項選擇題

Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）

A.data link layer
B.application layer
C.access layer
D.session layer
E.network layer

4.多項選擇題某單位路由器防火墻作了如下配置：firewall enableacl 101rule permit ip source 202.38.0.00.0.0.255 destination 10.10.10.100.0.0.255rule deny tcp source 202.38.0.00.0.0.255 destination 10.10.10.100.0.0.255 destination-portgreater-than 1024rule deny ip source any destination any端口配置如下：interface Serial0ip address 202.38.111.25.255.255.255.0link-protocol pppfire wall packet-filter 101 ininterface Ethernet0Ip address 10.10.10.1255.255.255.0內(nèi)部局域網(wǎng)主機(jī)均為10.10.10.0255.255.255.0網(wǎng)段，以下說法正確的是（本題假設(shè)其它網(wǎng)絡(luò)均沒有使用acl）（）。

A.外部主機(jī)202.38.0.50可以PING通任何內(nèi)部主機(jī)
B.內(nèi)部主機(jī)10.10.10.5，可任意訪問外部網(wǎng)絡(luò)資源
C.內(nèi)部任意主機(jī)都可以與外部任意主機(jī)建立TCP連接
D.外部202.38.5.0/24網(wǎng)段主機(jī)可以與此內(nèi)部網(wǎng)主機(jī)TCP連接
E.外部202.38.0.0/24網(wǎng)段主機(jī)不可以與此內(nèi)部同主機(jī)建立目標(biāo)端口號大于1024的TCP連接

5.單項選擇題

Refer to the exhibit. Which command would allow the translations to be created on the router?（）

A.ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 19
B.ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 19
C.ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 18
D.ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 18