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单选题A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. What action will the router take？（）A forwards the packetB fragments the packetC drops the packet silentlyD drops the packet and sends an IC

题目
单选题
A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. What action will the router take？（）
A

forwards the packet

B

fragments the packet

C

drops the packet silently

D

drops the packet and sends an ICMP message

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相似问题和答案

第1题：

A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?()

A. It performs a label pop operation and an IP lookup.

B. It performs a label swap operation and an IP lookup.

C. It sends an error message toward the egress router.

D. It sends an error message toward the ingress router.


参考答案：A

第2题：

Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network.Which of the following answers best describes the router‘s logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）

A. When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interface

B. When routing the packet, matching a route whose outgoing interface is the GRE tunnel interface

C. When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interface

D. When permitted by an ACL that was referenced in the associated crypto map


参考答案：B

第3题：

阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.

A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table


正确答案：D,D,C

第4题：

Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network. Which of the following answers best describes the router's logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）

  • A、When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interface
  • B、When routing the packet, matching a route whose outgoing interface is the GRE tunnel interface
  • C、When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interface
  • D、When permitted by an ACL that was referenced in the associated crypto map

正确答案:B

第5题：

Refer to the exhibit. What does the (*) represent in the output?()

A.Packet is destined for a local interface to the router.

B.Packet was translated, but no response was received from the distant device.

C.Packet was not translated, because no additional ports are available.

D.Packet was translated and fast switched to the destination.


参考答案：D

第6题：

Which action does the ping 172.18.1.1 size 5 command perform?()

A. It sends only five ping requests to the 172.18.1.1 destination.

B. It sends a continuous ping with a packet length of five bytes to the 172.18.1.1 destination.

C. It sends five rapid ping requests to the 172.18.1.1 destination.

D. It sends a continuous rapid ping with a packet length of five bytes to the 172.18.1.1 destination.


参考答案：B

第7题：

A router receives a packet on interface 172.16.45.66／26. The source IP of the packet is 172.16.45.127／26 and the destination is 172.16.46.191／26.How will the router handle the packet?()

A. The destination is a host on another subnet, so the router will not forward the packet.

B. The destination is a host on the same subnet, so the router will forward the packet.

C. The destination is a broadcast address, so the router will not forward the packet.

D. The destination is a network address, so the router will forward the packet.


参考答案：C

第8题：

An internet is a combination of networks connected by (71) .When a datagram goes from a source to a (72) ，it will probably pass many (73) until it reaches the router attached to the destination network．A router receives a (74) from a network and passes it to another network．A router is usually attached to several networks．When it receives a packet，to which network should it pass the packet? The decision is based on optimization： Which of the available (75) is the optimum pathway?

A．modems

B．routers

C．switches

D．computers


正确答案：B

第9题：

Anytime a host or a router has an IP datagram to send to another host or router, it has the（　）address of the receiver. This address is obtained from the DNS if the sender is the host or it is found in a routing table if the sender is a router. But the IP data gram must be（　） in a frame to be able to pass through the physical network. This means that the sender needs the （　）address of the receiver. The host or the router sends an ARP query packet. The packet includes the physical and IP addresses of the sender and the IP address of the receiver. Because the sender does not know the physical address of the receiver, the query is（　） over the network.Every host or router on the network receives and processes the ARP query packet, but only the intended recipient recognizes its IP address and sends back an ARP response packet.The response packet contains the recipient's IP and physical addresses. The packet is（请作答此空） directly to the inquirer by using the physical address received in the query packet.

A. multicast
B. unicast
C. broadcast
D. multiple unicast

答案：B
解析：
任何时候主机或路由器要发送 IP 数据报发送给另一主机或路由器时，都需要知道接收方的逻辑地址。发送主机从 DNS 获得该地址，发送路由器则在路由表中找到该地址。但 IP 数据报必须封装在帧中才能通过物理网络。这意味着发送者需要知道接收者的物理地址。主机或路由器需发送 ARP 查询报文，该报文分组包含发送者的物理地址和 IP 地址及接收者的 IP 地址。这是因为送者不知道接收者的物理地址，所以需在全网广播报文。网络上的每个主机或路由器都能接收并处理该 ARP 查询报文，但只有预期的接收者识别其 IP 地址并响应该 ARP 报文。响应报文包含接收者的 IP 地址和物理地址。包含了接收者物理地址的响应报文分组通过单播的方式直接发送给发送者。

第10题：

How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）

  • A、It will fragment the packet at Layer 2.
  • B、It will fragment the packet at Layer 3.
  • C、It will drop the packet and send an ICMPv6 message "packet too big" back to the source.
  • D、It will drop the packet.

正确答案:C

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