forwards the packet
fragments the packet
drops the packet silently
drops the packet and sends an ICMP message
第1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
第2题：
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.
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
第4题：
How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）
第5题：
Which command enables OSPF for IPv6?（）
第6题：
A. a telnet to port 80
B. a TCP packet with the SYN and ACK flags set
C. an SNMP getnext request
D. an ICMP packet larger than 1024 bytes
第7题：
A. router ospf ipv6 process - id
B. ipv6 ospf process - id
C. router ospf process - id
D. ipv6 router ospf process - id
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?
（71）
A. modems
B. routers
C. switches
D. computers
（72）
A. user
B. host
C. city
D. destination
（73）
A. destinations
B. routers
C. packets
D. computers
（74）
A. destination
B. resource
C. packet
D. source
（75）
A. pathways
B. routers
C. diagrams
D. calls
第9题：
Which of the following statements about authentication responses and conditions is true? （）(Choosetwo.)
第10题：
Which action does the ping 172.18.1.1 size 5 command perform?（）