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NEW QUESTION 93
As shown in the figure, the cost value of the link that all interfaces of the router enable DSPF is identified in the figure.
The Loopback D interface of R2 is advertised in area 1. Then the cost value of R1 to 10.2/32 is:
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 94
The rules of RR advertising routes violate the rules of IBGP split horizon, so it may cause loops in the AS road. Which routing attributes does RR use to prevent loops?
- A. Cluster List
- B. AS-PATH
- C. Nexthop
- D. Originator ID
Answer: A,D
NEW QUESTION 95
What is the most effective way to view device alarms through CLI?
- A. display interface brief
- B. display c1ock
- C. display alarm
- D. display current-configuration
Answer: C
NEW QUESTION 96
An engineer used two routers to test IPv6 services, and simulated the interconnection between headquarters and branches by running BGP4+.
The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between two devices, which of the following statements is wrong?
- A. If the Update message carries the MP_REACH_NLRI attribute, it means that the advertised route is reachable
- B. When routing, the Next_Hop attribute must be an IPv6 global unicast address
- C. When routing, it will carry AS_Path and other recognized mandatory attributes
- D. BGP4+ transmits routing information between peers through Update messages
Answer: B
NEW QUESTION 97
The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. Then, which of the following statements about Discovery message in the basic discovery mechanism is correct? (Multiple choice)
- A. The destination IP address of the message is the multicast IP address 224.0.0.2
- B. After the TCP connection is established, the LSR does not continue to send Hello Message
- C. The message is sent to the designated LDP Peer
- D. This message is encapsulated in a UDP message, and the destination port number is 646
Answer: A,D
NEW QUESTION 98
As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so there is no type 3 LSA in the LSDB of R3.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION 99
The routing attributes of the three routing entries are shown in the figure. Assuming that the next hop of the three routing entries are all reachable, when the three routing entries arrive at the BP router in sequence, by default, BGP will finally select one route entry?
- A. Route C
- B. Route A
- C. Route B
Answer: B
NEW QUESTION 100
There is the concept of forwarding equivalence class FEC in MPLS. The following description is wrong:
- A. sameFECgrouped inMPLSThere will be different processing in the network
- B. FECThe division is very flexible. Can be the source address, and the address, source port, destination port, protocol type or
- C. MPLSGrouping packets with the same forwarding processing method is calledFEC
- D. a forwarding equivalence classFECA unique label value is assigned on all routers
Answer: A,D
Explanation:
VPNEqual to any combination of division basis
NEW QUESTION 101
The description of the MPLS forwarding mechanism is correct
- A. ifTumel IDvalue is not0x0,into the normalIPForwarding process
- B. The system automatically allocates aI. also known asTunnel ID
- C. whenIPmessage entryMRLSdomain, the first thing to look at isFIBsurface
- D. ifTunnel IDvalue is0x0test entryMPLSForwarding process
Answer: B,C
NEW QUESTION 102
As shown in the figure, all interfaces of the router enable DSPF. The cost value of the link is marked in the figure. R2 The LoopbackD interface is advertised in area 1, then the cost of R1 reaching 10.2/32 is?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 103
In the process of viewing the debug output through the SSH terminal, a lot of information pops up. Which of the following operations can Make the Moni tor terminal no longer pop up debug messages?
- A. open notepad inputundo terminal debugging,Copy the command line and paste it intoMonitorinterface
- B. exit currentMonitorinterface redesignSSHLog in to the device to open a new oneMonitorinterface
- C. Open Notepad$SLIAundo terminal monitor,Copy the command line and paste it intoMonitorinterface
- D. Open Notepad and enterundo debugging a 11,Copy the command line and paste it intoMonitorinterface
Answer: A,C,D
NEW QUESTION 104
As shown, all routers run OSPF. Which of the following statements is correct?
- A. R2WillR1GeneratedRouter LSAforward toR3
- B. R2only in area0generated inRouter LSA
- C. R2in the area1and area0will generateRouter LSA
- D. R2WillR3GeneratedRouter LSAforward toR1
Answer: C
NEW QUESTION 105
SFFv2 is an IGP running on an IPv4 network: 0SPFV3 is an IGP running on an IPv6 network. Compared with 0SPFV2, SPFV3 has a similar LSA type, but has slightly different functions. Which of the following is not included in the LSA type of 0SPFV3?
- A. Router-LSA
- B. ASBR-Summary-LSA
- C. Network-LSA
- D. AS-External-LSA
Answer: B
NEW QUESTION 106
As shown in the figure, configure a backhaul summary route 10.0.0.0/24 on the border route RT1. next hop to RT2. At the same time, the default route to the external network is configured. At this point, a routing black hole will appear. The following is about routing Is the black hole statement correct? (multiple choice)
- A. Routing black hole has no impact on the network and can be ignored
- B. Precise routing can always avoid routing black holes
- C. Configuring black hole routing can solve the routing black hole problem
- D. If the terminal in the network sends data packets to the network segment that does not appear on the internal network, a loop will occur
Answer: B,C,D
NEW QUESTION 107
The Router LSA of a router is shown in the figure. Which of the following statements is wrong?
- A. of this routerRouter IDfor10.0.12.1
- B. This router has established an adjacency relationship
- C. This router supports external route import
- D. This router isDR
Answer: D
NEW QUESTION 108
LDP messages are exchanged between LSRs running the LDP protocol. LDP messages can be divided into four types according to their functions. Which of the following is not an LDP message type?
- A. Label exchange messages
- B. Discovery
- C. Conversation message
- D. Announcement
Answer: A
NEW QUESTION 109
IS-IS is a link state routing protocol that uses the SPF algorithm for routing calculations. A park has deployed IPv4 and IPv6 at the same time and runs IS-IS to achieve network interconnection. As shown in the figure, the network IPv4 and IPv6 have the same overhead, and R1 and R4 only support IPv4. By default, in the calculated IPv6 shortest path tree, the next hop device for R2 to access R6 is () (Note: The device name must be consistent with the figure, such as: R1)
Answer:
Explanation:
R3
NEW QUESTION 110
Which of the following role of Link-LSA in OSPFv3 not include?
- A. Notify other routers on the link of the options set in the Network-LSA originating from this link
- B. Advertise the interface ID of this router to other routers on the link
- C. Noon time to Tiandikou on other roads on the link-
- D. Advertise the link-local address of this interface to other routers on the link
Answer: C
NEW QUESTION 111
Which of the following reasons may cause the hosts in the same--VLAN LAN to fail to communicate with each other
- A. port isolation is configured on the switch
- B. interface is artificialshutdownor the physical interface is damaged
- C. the wrong port is configured on the machine, andMA, Caddress binding
- D. switchMA, Caddress learning errors
Answer: A,B,C,D
NEW QUESTION 112
As shown in the figure, the network has caused a loop because STP is not enabled. Which of the following phenomena may be caused? (Multiple choice)
- A. MAC address table flapping
- B. The device will have a loop alarm
- C. A large number of broadcasts can be received on the Host
- D. The device CPU usage is too high
Answer: A,B,C,D
NEW QUESTION 113
As shown in the figure, a certain park has deployed IPv6 for service testing, and there are 4 routers in the network. Run OSPFv3 to realize network interconnection.
Regarding the LSA generated by the OSPFv3 network, which of the following statements is wrong?
- A. R1 itself will generate Router-LSA to describe device interface information, and will receive Router-LSA generated by R2 and R3 at the same time
- B. R1 will receive the two Link-LSAs generated by R2, describing the two links information connected to R2 respectively
- C. There is a Network LSA generated by R3 in the LSDB of R1, indicating that R3 may be the DR of this link
- D. As an ABR, R2 will generate Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area 1, and advertise it to R1 and R3
Answer: B
NEW QUESTION 114
Regarding the MPLS forwarding process, which description of the ingress node forwarding is correct? (Multiple choice)
- A. Press the obtained label in the IP packet, and process EXP according to the QoS policy, and process L at the same time, and then send the encapsulated MPLS packet to the next hop
- B. After receiving the data packet, the Ingress node will first check the ILM table to find the Tunnel ID
- C. Check the NHLFE entry, you can get the outgoing interface, next hop, outgoing label, and label operation type. The label operation type is Push
- D. Find the corresponding NHLFE entry according to the Tunnel ID of the ILM table, and associate the LFlB entry with the NHLFE entry
Answer: A,C
NEW QUESTION 115
Which description is correct about the label encapsulation format in MPLS? (Multiple choice)
- A. The total length of a single MPLS label is 4 bytes (32 bits)
- B. The TTL field in the label is similar to the TTL (Time To Live.) in the IP packet, and it also has the effect of preventing loops.
- C. The S field in the label: 1 bit, used to identify whether the label is the bottom label of the stack, when the value is 1, it indicates the second-to-last label
- D. For Ethernet and PPP packets, the label stack is located between the layer 2 header and the data like a "underlay*": when there is a VLAN tag, the MPLS header is placed between the Ethernet header and the VLAN tag
Answer: A,B
NEW QUESTION 116
Which of the following descriptions about MPLS header TTL are correct? (Multiple choice)
- A. The processing method of copying the IP TTL value hides the LSR of the MPLS domain and plays a certain security role
- B. There are two ways to correct MPLST and TTL. One is to copy the TTL value of the MPLS header when an IP packet enters the MPLS network. The other is to set the TTL of the MPLS header to 255 at the ingress LER.
- C. Can prevent infinite loop forwarding of messages
- D. In the case of banning Bay TTL, tracert can see the LSR of the MPLS domain that it passes through
Answer: B,C
NEW QUESTION 117
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