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？（）Aforwards the packetBfragments the packetCdrops the packet silentlyDdrops the packet and sends an ICMP message
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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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 routers 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 routers 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
● 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. modemsB. routersC. switchesD. computers（72）A. userB. hostC. cityD. destination（73）A. destinationsB. routersC. packetsD. computers（74）A. destinationB. resourceC. packetD. source（75）A. pathwaysB. routersC. diagramsD. calls
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For which network anomaly does Junos provide a SCREEN?() A. a telnet to port 80B. a TCP packet with the SYN and ACK flags setC. an SNMP getnext requestD. an ICMP packet larger than 1024 bytes
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.
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For which network anomaly does Junos provide a SCREEN?（）A、a telnet to port 80B、a TCP packet with the SYN and ACK flags setC、an SNMP getnext requestD、an ICMP packet larger than 1024 bytes
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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.
Which command enables IPv6 forwarding on a cisco router?（）A、ipv6 hostB、ipv6 unicast-routingC、ipv6 localD、ipv6 neighbor
Which three causes could prevent a host from getting an IPv6 address with stateless autoconfiguration？（）A、The autoconfig command is missing from the router interface.B、IPv6 multicast routing is not enabled on the router interface.C、IPv6 unicast routing is not enabled on the router interface.D、The router interface is configured with a /63 mask.E、The router interface is configured with a /65 mask.
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单选题How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）AIt will fragment the packet at Layer 2.BIt will fragment the packet at Layer 3.CIt will drop the packet and send an ICMPv6 message packet too big back to the source.DIt will drop the packet.
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单选题Which mechanism does OSPFv3 use when the router LSA is too big to be sent out？（）AIt relies on IPv6 to do the fragmenting.BIt splits the LS Update packet into smaller packets.CIt splits the LSA into smaller router LSA packets.DIt produces an error.
单选题A router receives an IPv6 packet which is 2000 bytes in length. The MTU of the outgoing interface is 1500 bytes. Which action will the router take?（）AForward the packet.BFragment the packet.CDrop the packet silently.DDrop the packet and send an ICMPv6 message.
单选题A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）AIt performs a label pop operation and an IP lookup.BIt performs a label swap operation and an IP lookup.CIt sends an error message toward the egress router.DIt sends an error message toward the ingress router.