EMT Practice Test

1. Question Content...

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Question1: Configure under a certain interface: isis timer hello 5 leve1-2, which of the following statements is correct?

Question2: In BGPIMPLS IP VPN, if the OSPF protocol is used to exchange routing information between PE and CE, the domain identifier (Domain ID) is used to distinguish whether the routes imported in the VPI instance are from the same OSPF domain.

Question3: In the VLAN aggregation technology, multiple Sub-VLANs are used to isolate the wide recruitment area, and these Sub-VLANs are aggregated into a logical Super-VLAN. A company divides different departments into different Sub-VLANs because of the Sub-VLAN. VLAN not only includes physical connections, but also can establish a three-layer VLANIF interface, which can directly communicate with the external network on the three-layer.

Question4: Which of the following reasons may cause the hosts in the same VLAN of the LAN to fail to communicate? (Multiple choice)

Question5: As shown in the figure, network administrator A on the R1 router, after modifying the Local Preference value of the routing entry sent to R2 through the routing policy, can control the path of traffic leaving AS100.

Question6: As shown in the figure:

Question7: In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain all the labels distributed by the LDP Peer, regardless of whether the LDP Peer is the optimal next-hop to reach the target network segment.

Question8: A router Network LSA is shown in the figure. Which of the following statements is correct? (Multiple choice)

Question9: OSPFv2 is an IGP running on an IPv4 network; OSPFv3 is an IGP running on an IPv6 network. The basic working mechanism of OSPFv3 is the same as OSPFv2, such as the election of DR and BDR. As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection and interoperability of IPv6 networks by running OSPFv3.

Which of the following statements regarding the election of DR on this network is correct?

Question10: When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice)

Question11: 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)

Question12: A router is running OSPF, and the output information is as shown in the figure. Which of the following statements is correct?

Question13: (Drag and drop) As shown in the figure, there is a message containing three-layer label headers. Please select the corresponding values of the X, Y, and Z fields in the figure. (Decimal)

Question14: Which of the following will not cause the VRRP backup group to oscillate?

Question15: Which of the following role of Link-LSA in OSPFv3 not include?

Question16: There is the concept of forwarding equivalent FEC in MPLS. Which of the following descriptions is wrong? (Multiple choice)

Question17: Which of the following are the advantages of VLAN aggregation? (Multiple choice)

Question18: The RR rules for advertising routes break the IBGP split horizon rules, so it may cause loops in the AS.
What routing attributes does RR use to prevent loops? (Multiple choice)

Question19: In an MPLS network, there are different types of operations for labels, among which the meaning of the "pop" action is?

Question20: In an intra-domain MPLS VPN network, when a data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Which of the following description is wrong about the two layers of labels? (Multiple choice)

Question21: As shown in the figure, a sham link is established between PE1 and PE2 through the LoopBackD interface. CE2 can learn the route to the 192.168.1.0/24 network segment (the direct route on CE1) through the sham link and backdoor link. If you keep the default configuration, the cost value of the route from CE2 to the 192.168.1.0/24 network segment should be (). (Please fill in the Arabic numerals directly, without symbols)

Question22: Which of the following is wrong about DHCP Snooping?

Question23: Which of the following statements about the MP_REACH_NLRI attribute of BGP4+ is correct? (Multiple choice)

Question24: Which of the following statements about MUX VLAN are correct? (Multiple choice)

Question25: EGP authentication can prevent illegal routers from establishing neighbors with BCP routers. BCP authentication can be divided into MD5 authentication and Keychain authentication. Which of the following BGP messages will carry BCGP Keychain authentication information? ((Multiple choice)

Question26: Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

Question27: A certain park deployed both IPv4 and IPv6 networks for service testing, and IS-IS was run to achieve network interconnection. IS-IS routing protocol has good scalability and is widely used in existing networks.
Regarding IS-IS scalability, which of the following statements are correct? (Multiple choice)

Question28: Which of the following is not part of the preliminary preparations for the cutover plan?

Question29: What are the work that needs to be performed in the closing phase after the cutover acceptance is completed? (Multiple choice)

Question30: In the test phase of cutover, which standards that can indicate the test has been completed?

Question31: In an MPLS domain, LSR can be divided into Ingress LSR, Transit LSR and Egress LSR according to the way the LSR processes data. For the same FEC, a certain LSR can be the Ingress LSR of the FEC or the Transit LSR of the FEC.

Question32: R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what does this command mean?

Question33: Which of the following statements about LDP label retention-free way is correct? (Multiple choice)

Question34: As shown in the figure:

Question35: Which statements are wrong about OSPF Router LSA and Network LSA? (Multiple choice)

Question36: Which of the following descriptions about MPLS header TTL are correct? (Multiple choice)

Question37: According to this figure, it can be known that in VLAN300, 0 MAC drift occurred by 00e0-fc3d-3bdb from 17:22:38 to 17:22.44 on 2020-06-04.

Question38: In the intra-domain MPLS VPN network, when the data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Which of the following description of the two layers of labels is wrong?

Question39: . OSPFv2 is an IGP running on an IIPv4 network. OSPFV3 is an IGP running on an IPv6 network. Compared with OSPFv2, OSFv3 has similar LSA, but the function is slightly different. The following is the description of the LSA function of OSPFv3. Please drag the LSA to the correct LSA function column.

Question40: The routing policy tools that BGP can use mainly include Filterpolicy and Route-policy. Its Fiterpolicy can only filter routes, and Rote-policy can only modify routes.

Question41: In the finishing work of the structured network troubleshooting process, which of the following are the documents that need to be handed over? (Multiple choice)

Question42: Which description is correct about the label encapsulation format in MPLS? (Multiple choice)

Question43: Qing technology is a technology that expands the VLAN space. It achieves the function of expanding the VLAN space by adding a layer of 8D2.1Q Tag on the basis of the 8Q2.12 tag message.
Which of the following statements about qinq is wrong?

Question44: Basic QinQ can select the outer tag encapsulation method according to the type of business.

Question45: The configuration shown in the figure is performed on R2 to filter all received routes. Assuming that there is a BGP route with the AS_Path attribute of [100 200 300 400] on R1 that needs to be sent to R2, please help the network administrator to adjust the order of AS in the AS_Path attribute of the route on R1 to ensure that the routing entries will not be filtered by the routing policy of R2. (Sorting questions)

Question46: In an MPLS VPN network, data packets are forwarded when they enter the public network. Will be encapsulated with two layers of MPLS labels.
Which of the following descriptions are correct about the processing of the data packet? (Multiple choice)

Question47: Which of the following information can the DHCP binding table contain? (Multiple choice)

Question48: Please sort by the cutover execution steps.

Question49: Which of the following commands can be used to view BGP VPNv4 routing and BGP private network routing information on the PE?

Question50: When MPLS is deployed in the network and the network layer protocol is IP, the route corresponding to the FEC must exist in the IP routing table of the LSR, otherwise the label forwarding entry of the FEC will not take effect.

Question51: As shown in the figure, the MP_BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Which of the following options will cause this problem? (Multiple choice)

Question52: ping -a X-c Y-s z -vpn-instance M 10.5.16.2, what is the meaning of this command is? (Multiple choice)

Question53: When troubleshooting dual-master faults in a VRRP backup group, which of the following statements is wrong?

Question54: Which of the following descriptions is wrong?

Question55: Regarding the description of the label encapsulation format in MPLS, which one is correct? (Multiple choice)

Question56: As shown in the figure, all interfaces of the router enable OSPF. Which of the following statements is correct?

Question57: Regarding the role of ping and tracert, which of the following statements is correct?

Question58: A company consists of a head office and two branches, and uses MPLS VPN technology to deliver private network routes. In the networking mode of HuB & Spoke. Branches can only send and receive routing with the head office, and branches cannot directly send and receive routing with each other. In order to achieve the above requirements, which of the following options can be set for RT? (Multiple choice)

Question59: Which of the following functions will affect the establishment of BGP neighbors? (Multiple choice)

Question60: In a multi-level RR scenario, a large number of second-level RR are connected to the first-level RR, which may cause the BGP routing table of the first-level RR to overflow. What method can be used to reduce the risk of overflow of the BGP routing table of the first-level RR?

Question61: The network administrator A wants to use the IP Prefix List to match specific routing entries. Which of the following routes will be matched by the IP Prefix List? (Multiple choice)

Question62: BGP4+ carries the next hop address of the IPv6 route through the Next Hop attribute in the Update message.

Question63: During 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 the debug message? (Multiple choice)

Question64: As shown in the figure, R1, R2, R3, and R4 are in the same MPLS domain, and LDP is used to allocate MPLS labels between devices. R4 is the FEC Egress LSR of 4.4.4.0/24. If you want to realize that when R1 accesses 4.4.4.0/24, R4 does not need to query the label table but can understand the forwarding priority of the data, then R3's outgoing label for the FEC should be (). (Please fill in the Arabic numerals directly, without symbols)

Question65: In the LDP session establishment process, the active party will first send the lnitialization information for parameter negotiation, and if the passive party does not accept the negotiation parameters, it will send _____ .

Question66: Part of the configuration of R1 is as follows. Which of the following statement about IS-IS on R1 is correct? (Multiple choice)

Question67: Regarding the label space of MPLS, which of the description is wrong?

Question68: In BGP/MPLS IP VPN, the OSPF multi-instance process uses the DN bit to prevent Type5 LSA loops.

Question69: A park deployed IPv6 for business testing. There are 4 routers in the network, running OSPFV3 to realize the interconnection and intercommunication of IPv6 networks. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of the Link-LSAs. Regarding the description of the LSA, which of the following statements are correct? (Multiple choice)

Question70: For the same MAC address, the priority of the manually configured MAC entry is higher than the automatically generated entry.

Question71: What is the command to adjust the link cost value of an IS-IS interface?

Question72: Which packets can Huawei devices perform traffic suppression for? (Multiple choice)

Question73: Which LSA in OSPFv3 can be flooded within an area?

Question74: Which of the following statements about the OSPFv3 message format is correct? (Multiple choice)

Question75: As shown in the figure, which of the following statement is correct? (Multiple choice)

Question76: If the Sticky MAC function of the interface is enabled, what is the number of MAC addresses learned by the interface by default?

Question77: IEIF has extended the functions of OSPF by taking advantage of the strong scalability of OSPF. To enable it to support IPv6 networks, the expanded protocol is called OSPFv3, and OSPFv3 is compatible with OSPFv2.

Question78: As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLS IPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the label information is shown in the figure), and PF1 has advertised the 192.168.1.0/24 network segment route in Site1 to PE2 through the MP.JIBGP neighbor relationship, and the route learning is normal.

When capturing the data that Site2 visits the 192.168.1.0/24 of Site1 between P and PE1, what should be the outermost label?

Question79: The output information of a router is as follows. Which of the following reasons cause the OSPF adjacency relationship to fail to be established normally? (Multiple choice)

Question80: Senior engineers with rich experience can quickly solve faults only by relying on experience, and the efficiency is very high.

Question81: As shown in the figure, all interfaces of the router enable OSPF. The IP address identified in the figure is the IP address of the oopback0 interface of the device. Loopback0 of R1 and R2 is advertised in area 1, Loopback0 of R4 is advertised in area 0, and Loopback0 of R3 and R5E are advertised in area 2, which of the following IP addresses can ping each other? (Multiple choice)

Question82: Ethernet is a network that supports broadcasting. Once there is a loop in the network, this simple broadcasting mechanism will cause catastrophic consequences.
Which of the following phenomena may be caused by loops? (Multiple choice)

Question83: Regarding the MPLS forwarding process, which description of the ingress node forwarding is correct? (Multiple choice)

Question84: By default, LDP adjacencies will trigger the establishment of LSP based on the IP routing of the 32bit address.

Question85: What is the Router-ID of OSPFv3?

Question86: According to this picture, what can we judge? (Multiple choice)

Question87: As shown in the figure, all interfaces of the router enable OSPF, among which R4 and R5 can establish OSPF virtual connections.

Question88: After configuring the VLAN-based MAC address drift detection function, if the MAC address drifts, you can configure the actions of the interface according to your needs.
Which of the following is not a configurable action?

Question89: The ipv6 enable topology standard is configured in IS-IS protocol view. The meaning of this command is that Pv4 and IPv6 share the same topology.

Question90: A network engineer outputs the following information when troubleshooting OSPF. Based on this, determine which reason causes the adjacency relationship to fail to be established normally?