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单选题What does a router do?（）A Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)B Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-are

题目
单选题
What does a router do?（）
A

Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)

B

Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-area network (LAN) to the wide-area network (WAN)

C

Stores data on the network and connects the local-area network (LAN) to the wide-area network (WAN)

D

Broadcasts data to all devices that are connected to it across the local-area network (LAN) and wide-area network (WAN)

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相似问题和答案

第1题：

A( ) is a computer commtuucation network in a local area, which connects various computers.

A.Intemet

B.MAN

C.WAN

D.LAN


正确答案：D
LAN（局域网）是在局部区域内连接各种计算机的通信网。

第2题：

What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?()

A. It routes all traffic that is addresses to the destination network to the interface indicates in the routing table.

B. It sends a copy of its neighbor table to all adjacent routers.

C. It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.

D. It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.


参考答案：C

第3题：

A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?

A. BPDU

B. Port security

C. RSTP

D. STP

E. VTP

F. Blocking mode


正确答案：B
B 解析：Explanation:
Understanding How Port Security Works:
You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station attempting to access the port is different from any of the MAC addresses specified for that port. Alternatively, you can use port security to filter traffic destined to or received from a specific host based on the host MAC address.

When a secure port receives a packet, the source MAC address of the packet is compared to the list of secure source addresses that were manually configured or autoconfigured (learned) on the port. If a MAC address of a device attached to the port differs from the list of secure addresses, the port either shuts down permanently (default mode), shuts down for the time you have specified, or drops incoming packets from the insecure host.

The port's behavior. depends on how you configure it to respond to a security violation. If a security violation occurs, the Link LED for that port turns orange, and a link-down trap is sent to the Simple Network Management Protocol (SNMP) manager. An SNMP trap is not sent if you configure the port for restrictive violation mode. A trap is sent only if you configure the port to shut down during a security violation.

第4题：

What is A WAN？（）

  • A、A network that connects client devices wirelessly using radio waves
  • B、A network that crosses metropolitan, regional, or national boundaries
  • C、A network that is restricted.to a single building ,a group of buildings, or even a single room
  • D、A network that encompasses an entire city or metropolitanared. and. connects multiple LANs

正确答案:D

第5题：

The local area network also connects to a wide area network that allow a message ___ across the country or to other countries.

A.send
B.sending
C.to be sent
D.is sent

答案：C
解析：
四个选项皆为send“发送”的不同形式。而题目意为“局域网连入广域网，就允许在国内或国际间发送信息。”这里指发送信息，信息message在动词发送send前，所以使用被动形式，即to be done。D选项出现谓语动词is，造成动词重复。
　　

第6题：

What does a router do?()

A.Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)

B.Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-area network (LAN) to the wide-area network (WAN)

C.Stores data on the network and connects the local-area network (LAN) to the wide-area network (WAN)

D.Broadcasts data to all devices that are connected to it across the local-area network (LAN) and wide-area network (WAN)


参考答案：A

第7题：

The local area network also connects to a wide area network that allow a message ______ across the country or to other countries.

A.is sent
B.to be sent
C.sending
D.send

答案：B
解析：
本题考查动词语态。题干意为“局域网连入广域网，就允许在国内或国际间发送信息。”题干中，allow sb （sth） to do为固定搭配，另外此处表示信息被传播，所以用被动形式，即to be done，因此B选项正确。
　　

第8题：

An administrator replaced a router with a switch. End users are able to access network shares butare not able to access the Internet. Which of the following is the BEST explanation why the usersare unable to access the Internet?（）

A. Router routes traffic between different networks and a switch does not

B. The new switch is faulty and needs to be replaced and configured correctly

C. The firewall needs to be setup to allow traffic to reach the Internet

D. The switch needs to be setup to forward data traffic to the Internet


参考答案：A

第9题：

Which of the following storage technologies connects by TCP/IP and can slow down network traffic？（）

  • A、SAN
  • B、Optical jukebox
  • C、NAS
  • D、Tape library

正确答案:C

第10题：

A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?（）

  • A、BPDU
  • B、Port security
  • C、RSTP
  • D、STP
  • E、VTP
  • F、Blocking mode

正确答案:B

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