【名词&注释】
应用层(application layer)、交换机(switch)、端口号(port number)、会话层(session layer)、P路由器
[单选题]What is the purpose of the Spanning Tree Protocol (STP)?
A. To prevent routing loops
B. To create a default route
C. To provide multiple gateways for hosts
D. To maintain a loop-free Layer 2 network topology
E. To enhance the functions of SNMP
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举一反三：
[单选题]TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。
A. TELNET FTP HTTP
B. FTPT FTP HTTP
C. TELNET TFTP HTTP
D. TELNET DNS HTTP
[单选题]下列关于路由器和交换机的描述中，错误的是（）
A. 路由器可以用来连接internet
B. 二层交换机可以用来实现“异地网络”互连
C. 路由器可以用来做路径选择
D. 交换机可以转发广播
[单选题]On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?
A. Deleting unusable addresses through the creation of many subnets.
B. Combining routes to multiple networks into one supernet.
C. Reclaiming unused space by means of changing the subnet size.
D. Calculating the available host addresses in the AS.
E. None of the above
[单选题]SMTP工作在OSI哪一层（）
A. 会话层
B. 表示层
C. 传输层
D. 应用层
[多选题]The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)
A. ARP
B. CDP
C. DHCP
D. DNS
E. ICMP
[单选题]From where does a small network typically get its IP network addresses or IP block?
A. From the Internet Domain Name Registry (IDNR)
B. From the Internet Assigned Numbers Authority (IANA．
C. From the Internet Service Provider (ISP)
D. From the Internet Architecture Board (IAB．
E. None of the above
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