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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?（）
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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● 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
考题
路由器Router2的各接口已启用MPLS协议进程。在路由器Router2特权模式下分别输入以下3条命令：①show mpls ldp neighbor②show mpls ldp discovery⑧show mpls ldp bindings请解释以上3条配置命令各自完成什么功能?
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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．modemsB．routersC．switchesD．computers
考题
An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?()
A. EXP bitsB. VPI / VCIC. shim headerD. SNAP header
考题
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.
考题
When does the E－series router start monitoring DHCP traffic using the DHCP External function?()
A. When the discovery packet enters the router from the DHCP client.B. Only when the offer packet enters the router from the DHCP server.C. When the acknowledge packet enters the router from the DHCP server.D. Only when the discovery packet leaves the router going to the DHCP server.
考题
Based on the show ip bgp summary output, which two statements are true?()
A. The BGP session to the 10.3.3.3 neighbor is established, but the router has not received any BGP routing updates from the 10.3.3.3 neighbor.B. The router is attempting to establish a BGP peering session with the 10.2.2.2 neighbor.C. The router is attempting to establish a BGP peering session with the 10.1.1.1 neighbor.D. The BGP session to the 10.3.3.3 neighbor is established.E. The BGP session to the 10.2.2.2 neighbor is established.F. The BGP session to the 10.1.1.1 neighbor is established.
考题
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
考题
What is the best description of serialization delay？ （）A、the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB、the time it takes for a propagate from source to destinationC、the time it takes to place a frame on the physical medium for transportD、the time a packet resides in the outbound queue of a router
考题
There is MPLS VPN traffic traversing through a TE intermediate router. What is the MPLS packet labelstack sequence （from outer to inner） for the VPN traffic on this router？（）A、TE label， IGP label， VPN labelB、IGP label， TE label， VPN labelC、TE label， VPN label， IGP labelD、VPN label， IGP label， TE labelE、IGP label， VPN label， TE label
考题
Which of the following statements about authentication responses and conditions is true? （）(Choosetwo.)A、When a router receives a failure response, it stops querying authentication methods.B、When a router receives an error response, it stops querying authentication methods.C、If the router receives a failure response from an authentication method, it queries the next method.D、The router does not differentiate between failure and error responses; the authentication process is always interrupted.E、If it receives no response from the authentication method, a router will determine the error condition On its own; the router also has the option to proceed to the next method in a list if configured accordingly.
考题
Which four statements about the Carrier Supporting Carrier （CSC） feature are true？ （）A、MPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier.B、The backbone carrier must enable the PE router to check that the packets it receives from the CErouter contain only the labels that the PE router advertised to the CE router.C、Every packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labelsD、AII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite.E、Arouting protocol is required between the PE and CE routers that connect the backbone carrierto thecustomer carrier. The routing protocol enables the customer carrier to exchange IGP routing information with the backbone carrier.
考题
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.
考题
Which of the following statements about authentication responses and conditions is true?（）(Choose two.)A、When a router receives a failure response, it stops querying authentication methods.B、When a router receives an error response, it stops querying authentication methods.C、If the router receives a failure response from an authentication method, it queries the next method.D、The router does not differentiate between failure and error responses; the authentication process is always interrupted.E、If it receives no response from the authentication method, a router will determine the error condition on its own; the router also has the option to proceed to the next method in a list if configured accordingly.
考题
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.
考题
An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）A、EXP bitsB、VPI / VCIC、shim headerD、SNAP header
考题
多选题Which four statements about the Carrier Supporting Carrier （CSC） feature are true？ （）AMPLS is required between the PE and CE routers that connect the backbone carrier to the customer carrier.BThe backbone carrier must enable the PE router to check that the packets it receives from the CErouter contain only the labels that the PE router advertised to the CE router.CEvery packet that crosses the backbone carrier must be encapsulated so that the packet includes MPLS labelsDAII PE routers that link the backbone carrier to the customer carrier must run Route Target Rewrite.EArouting protocol is required between the PE and CE routers that connect the backbone carrierto thecustomer carrier. The routing protocol enables the customer carrier to exchange IGP routing information with the backbone carrier.
考题
单选题There is MPLS VPN traffic traversing through a TE intermediate router. What is the MPLS packet labelstack sequence （from outer to inner） for the VPN traffic on this router？（）A
TE label， IGP label， VPN labelB
IGP label， TE label， VPN labelC
TE label， VPN label， IGP labelD
VPN label， IGP label， TE labelE
IGP label， VPN label， TE label
考题
单选题You have a router running BGP for the MPLS network and OSPF for the local LAN network at the sales office. A route is being learned from the MPLS network that also exists on the OSPF local network.It is important that the router chooses the local LAN route being learned from the downstream switch running OSPF rather than the upstream BGP neighbor. Also，if the local OSPF route goes away，the BGP route needs to be used. What should be configured to make sure that the router will choose the LAN network as the preferred path？（）A
static route needs to be addedB
floating static route needs to be addedC
bgp backdoor commandD
ospf backdoor command
考题
单选题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.
考题
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 ICMP message
考题
单选题An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) 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 (5) is the optimum pathway?
空白（4）处应选择（）A
destinationB
resourceC
packetD
source
考题
单选题When does the E-series router start monitoring DHCP traffic using the DHCP External function?（）A
When the discovery packet enters the router from the DHCP client.B
Only when the offer packet enters the router from the DHCP server.C
When the acknowledge packet enters the router from the DHCP server.D
Only when the discovery packet leaves the router going to the DHCP server.
考题
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?（）A
Forward the packet.B
Fragment the packet.C
Drop the packet silently.D
Drop the packet and send an ICMPv6 message.
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