题目内容
（请给出正确答案）
●嗅探器改变了网络接口的工作模式，使得网络接口(49)。
(49)A．只能够响应发送给本地的分组
B．只能够响应本网段的广播分组
C．能够响应流经网络接口的所有分组
D．能够响应所有组播信息
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“●嗅探器改变了网络接口的工作模式，使得网络接口（49)。（49)A．只能够响应发送给本地的分组B．只能够”相关的问题
（1）A. 1.544Mb/s
B. 2.048Mb/s
C. 6.312Mb/s
D. 44.736Mb/s
（2）A. 56Kb/s
B. 64Kb/s
C. 128Kb/s
D. 2048Kb/s
（1）A. 1.544Mb/s
B. 2.048Mb/s
C. 6.312Mb/s
D. 44.736Mb/s
（2）A. 56Kb/s
B. 64Kb/s
C. 128Kb/s
D. 2048Kb/s
TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer （1）, at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world（2）TCP/IP.
The routing process begins with an IP address that is（3）to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the（4）. The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for（5）IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.
（1）A. up
B. down
C. sideward
D. back-fence
（2）A. via
B. through
C. by
D. through out
（3）A. special
B. especial
C. unique
D. particular
（4）A. accepter
B. sender
C. router
D. server
（5）A. searching
B. looking
C. locating
D. matching
(59) A. IPv6可以允许全局IP地址重复使用
B．IPv6解决了全局IP地址不足的问题
C．IPv6的出现使得卫星联网得以实现
D. IPv6的设计目标之一是支持光纤通信
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