EMT Practice Test

1. Question Content...

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Question1: As shown in the figure, the operator's BGP MPLS IP VPN backbone network constructs SP through DP. If the two sites of user X are to communicate through the BGP MPLS IP VPN network, PE1 and PE2 must use a 32-bit mask Loopback interface address to establish MP-IBGP peer relationship.

Question2: IS-IS supports multiple instances and multiple processes, that is, one IS-IS router, multiple VPN instances can be configured to be associated with multiple IS-IS processes. Which of the following descriptions about IS-IS multi-instance and multi-process are correct? (Multiple choice)

Question3: Configured on an interface: isis timer hello5 level-2, which of the following statements is correct?

Question4: R1, R2, R3, and R4 belong to OSPF area 0, and the cost of the link is shown in the figure.

Loopback0 of R1, R2, R3, and R4 is advertised into OSPF. R1, R2, R3, and R4 use Loopback0 as the connection interface to establish an IBGP peer relationship. R1, R2, and R3 are clients of R4. The directly connected network segment 172.20.1.4/32 of R4 is advertised into BGP. Regarding the traffic trend of R1 accessing 172.20.1.4/32, which of the following analysis is correct? (Multiple choice)

Question5: Which of the following statements about IS-IS (IPv4 6) is correct? (Multiple choice)

Question6: As shown in the figure, the network has a loop because STP is not enabled. Which of the following may be caused? (Multiple choice)

Question7: Configure ipv6 preference in IS-IS protocol view. The function of this command is to configure the priority of IPv6 routes generated by IS-IS protocol.

Question8: In order to improve network security in a company, all internal computers of the company are assigned static MAC addresses. Now buy a new host with MAC address 5489-98FD-7B7F. The network administrator connects the host to the corporate network by executing the mac-address ( ) 5489-98FD-TB7F GigabitEthernet0/0/1 vlan 10 command. (Please use English lowercase letters to complete the command, and the command cannot be abbreviated)

Question9: The QoS technique commonly used for congestion avoidance is?

Question10: A campus has deployed IPv6 for service testing. There are 4 routers in the network, running OSPFV3 to realize the interconnection of IPv6 networks.
As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of the Link-LSAs.

Which of the following statements about the description of this LSA is correct? (Multiple choice)

Question11: Which of the following limitations of traditional networks do not include?

Question12: IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. A campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection.
As shown in the figure, the IPV4 and IPv6 costs of this network are the same, and R1 and R4 only support IPV4. By default, in the IPv6 shortest path tree formed by calculation, the next hop device for R2 to access R6 is: ( ). (Note: the device name must be the same as the figure, such as: R1)

Question13: By viewing DHCP configuration information and packet statistics, you can view the running status of the device and the count of DHCP packets received and sent, so as to locate problems during routine maintenance. Which of the following commands can be used to view DHCP messages directly? (Multiple choice)

Question14: For which packets can Huawei equipment perform traffic suppression? (Multiple choice)

Question15: The rollback operation of project cutover can be temporarily determined according to the situation during cutover, and no advance plan is required.

Question16: MPLS is called multi-protocol label switching. Regarding the label description in MPLS, which of the following is correct? (Multiple choice)

Question17: Man-in-the-middle attacks or IP/MAC Spooping attacks can lead to information leakage and other hazards, and are more common in the intranet. To prevent man-in-the-middle attacks or IP/MAC Spooping attacks, which of the following configuration methods can be taken.

Question18: What are the main items included in the project implementation plan? (Multiple choice)

Question19: The packet filtering firewall provides support for detecting fragmented packets. What are the fragmented packets that the packet filtering firewall can filter? (Multiple choice)

Question20: By default, LDP adjacencies will trigger the establishment of LSP based on IP routing of 32-bit addresses.

Question21: As shown in the figure, a campus deploys OSPF to achieve network interoperability, and the Area is deployed as an NSSA area.

In order to allow R1 to access the loopback interface address of R4, an engineer introduces a direct route into the OSPF process of R4. Which of the following descriptions are correct? (Multiple choice)

Question22: The default MPLS label publishing mode, label distribution control mode and label retention mode of Huawei routers are:

Question23: What are the advantages of PQ+WFQ? (Multiple choice)

Question24: Regarding the description of OSPF's neighbor relationship failure, which of the following statements is false?

Question25: 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 PE1 has advertised the route of network segment 192.168.1.0/24 in Site1 to PE2 through the MPLS BGP neighbor relationship, and the route learning is normal.

When grabbing between P and PE1, when Site2 accesses the 192.168.1.0/24 data of Site1, what should be the outermost label?

Question26: In the topology shown in the figure, if the entire network runs OSPFv3 and no external routes are imported, what type of LSA will not be generated on R1? (Multiple choice)

Question27: A DHCP server can use different address ranges to assign to clients. Which description is correct about assigning addresses? (Multiple choice)

Question28: What can we infer from this graph? (Multiple choice)

Question29: In the MPLS VPN network, the data packets are forwarded when entering the public network. It will be encapsulated with two layers of MPLS labels. Which of the following description about the processing of the packet are correct? (Multiple choice)

Question30: Which of the following statements about ASPF and Servermap is true? (Multiple choice)

Question31: Which command descriptions are correct for the PC to obtain the address from the DHCP Sever? (Multiple choice)

Question32: BFD can implement link state detection at the s (millisecond) level.

Question33: As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is marked in the figure. The Loopback0 interface of R2 is advertised in area 1, then the Cost value of R1 reaching 10.0.2.2/32 is:

Question34: According to this figure, what can we judge? (Multiple choice)

Question35: Deploying port isolation technology in Ethernet can realize Layer 2 intercommunication and Layer 3 isolation, making networking more flexible.

Question36: What can we infer from this graph? (Multiple choice)

Question37: In the MPLS forwarding process, which descriptions are correct about the forwarding of the ingress node? (Multiple choice)

Question38: In the test phase of the cutover, the criteria for indicating that the test has been completed are:

Question39: Through the display ip interface GE0/0/0 command, you can view the statistics of ping packets received on this interface.

Question40: An engineer uses 2 routers to test the IPV6 service, and runs the BGP4+ module to communicate with the branch. As shown in the figure, an engineer captures packets to view the Update message sent by R1. Which of the following statements is true about the description of the message information? (Multiple choice)

Question41: As shown in the figure, the router runs OSPF, and Area 2 is a completely stubby area. Please match the LSA type and area ID contained in each area.

Question42: Regarding the sham link, which of the following descriptions is wrong?

Question43: If the neighbor does not advertise a certain route, it means that the neighbor may not put the descriptive information about the route into the local OSPF link state database.

Question44: Which of the following belong to the delivery process of dry MPLS VPN routes? (Multiple choice)

Question45: As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so there are no three types of LSAs in R3's LSDB.

Question46: After a fault occurs, it is necessary to collect and backup various types of fault information in time as a reference for handling faults.

Question47: esigth uses different colors to distinguish different alarm levels. Red means urgent, orange means important, yellow means minor, and blue means prompt. Which of the following statements about different alarm levels is true? (Multiple choice)

Question48: The ORF function of BGP can control the routing entries sent by neighbors. In order to achieve this purpose, the BGP router will send the list of routes to be filtered to the neighbor. Which tool is generally used to send the list to the neighbor?

Question49: As shown in the figure, the entire network of a company uses OSPF to open up the network. However, RouterS and RouterE cannot establish an OSPF neighbor relationship. When network administrators detect OSPF faults, they can run the display ospf ( ) 1000 interface GE0/0/1 command on RouterS to obtain information about the errors. Users can perform OSPF fault diagnosis based on the information. (Please use English lowercase letters to complete the command, and the command cannot be abbreviated)

Question50: When configuring MPLS VPNI, the administrator configured the command: interface GigabitEthernet0/0/0 ip binding vpn-instance VPN1 Interface GigabitEthernet0/0/1 ip binding vpn-instance VPN2. Which of the following description is wrong?

Question51: What characteristics must a high-risk operating program have? (Multiple choice)

Question52: When performing software and configuration backups, which of the following is correct?

Question53: Which description is correct about the DHCP address pool? (Multiple choice)

Question54: DHCP Snooping is a DHCP security feature that can be used to defend against a variety of attacks, including ( ). (Multiple choice)

Question55: Access control refers to restricting or blocking specific access traffic based on the needs of business management and control on the basis of reachable network routes.

Question56: MPLS is called Multi-Protocol Label Switching, which description is correct about the label in MPLS? (Multiple choice)

Question57: As shown in the figure, to enable the traffic between Site1 and Site2 to pass through the Hub-CE, VPN instances on two Spoke-PEs have been configured. Two VPN instances need to be created on the Hub-PE. The instance VPN in is used to receive routes from Spoke-PE, and the instance VPN out is used to advertise routes to Spoke-PE. Please select Import RT and Export RT for these two instances respectively. .

Question58: The three basic characteristics of an SDN network architecture are:

Question59: Which of the following commands is used to configure VRRP preemption delay?

Question60: The classic network forwarding method is based on routing table forwarding. The forwarding method of OpenFlow switches is based on flow table forwarding. For these two forwarding methods, which of the following statements are correct? (Multiple choice)

Question61: According to this figure, what can we judge? (Multiple choice)

Question62: In the following description, which of the following items are used to remind customers of information security? (Multiple choice)

Question63: The ipv6 enable topology standard is configured in the IS-IS protocol view. The meaning of this command is that IPv4 and IPv6 share the same topology.

Question64: OSPF is a very mature protocol. In the case of conventional networking and correct configuration, route calculation is generally not wrong. Which of the following reasons may cause OSPF neighbors to fail to reach the Full state? (Multiple choice)

Question65: Which descriptions about the MPLS forwarding mechanism are correct? (Multiple choice)

Question66: OSPF fast convergence is an extended feature to improve the speed of routing convergence. The working principle of PRC (Partial Route Calculation) is: when the network topology changes, only path calculation is performed on the affected nodes, thereby speeding up route computation.

Question67: Which of the following WAN links are part of a packet switched network? (Multiple choice)

Question68: If faced with a complex network failure, and after evaluation, it is considered that the troubleshooting cannot be completed in a short time, and the user urgently needs to restore the availability of the network, which of the following approach is correct?

Question69: 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 that of 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 of IPv6 networks by running OSPFv3.

Which of the following statements about the election of the network DR is correct?

Question70: Network administrator A wants to use the IP Prefix List to match a specific route entry. Which of the following routes will be matched by the IP Prefix List in the figure? (Multiple choice)

Question71: The operation process for putting the equipment on the shelf is to prepare the tools first, then install the mounting ears, install the floating nuts and slides according to the site conditions, and finally install the equipment to the cabinet.

Question72: When deploying MPLS/BGP IP VPN, which of the following descriptions is wrong regarding the use of BGP to exchange routing information between PE-CE?

Question73: The role of Link-LSA in OSPFv3 does not include:

Question74: Which of the following tools cannot be used to match BGP routing entries?

Question75: MTBF, MRRT and other indicators are used to describe which of the characteristics of the network?

Question76: What types of Link Types are included in the Router LSA in OSPF? (Multiple choice)

Question77: BFD determines whether a fault occurs by periodically detecting packets, and is a fast fault detection mechanism that relies on routing protocols.

Question78: According to this figure, what can we judge? (Multiple choice)

Question79: An engineer uses two routers to test IPV6 services, and simulates the interconnection between the headquarters and branches by running BGP4+.

The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between the two-way devices, which of the following statements is false?

Question80: According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?

Question81: Which of the following is correct when conducting equipment environmental inspections?

Question82: Which of the following descriptions of RT is correct? (Multiple choice)

Question83: The three authorizations required for high-risk operations do not include:

Question84: After configuring the VLAN-based MAC address flapping detection function, if the MAC address flaps, you can configure the actions of the interface as required.
Which of the following is NOT a configurable action?

Question85: The IS-IS neighbor relationship between R3 and R1 is not established. According to the information in this figure, what is the possible reason?

Question86: The end-to-end delay is equal to the sum of all processing delays and queue delays on the path

Question87: The routing policy tools that BGP can use mainly include Filter-policy and Route-policy, of which Fiter-policy can only filter routes, and Route-policy can only modify routes.

Question88: High-risk operations refer to all operations that may affect the stable operation of equipment, the normal operation of customer services, or the normal monitoring of network management.

Question89: What is the value of the linkage between OSPF and BFD?

Question90: As shown in the figure, in a medium-sized network, in order to improve the reliability of RR, BGP generally deploys double R.

When deploying dual EE, the Cluster IDs of the two RRs are generally set to be the same. What is the reason for this?

Question91: When a large number of IP phones and WLAN APs need to be accessed in the network, which type of switch is generally considered?

Question92: OSFFv2 is an IGP running on an IPv4 network, and OSPFV3 is an IGP running on an IPv6 network. Compared with OSPFv2, OSPFv3 has a similar LSA type, but has slightly different functions. Which of the following is not included in the LSA type of OSPFv3?

Question93: When there are multiple redundant links in an IS-IS network, multiple equal-cost routes may appear. Which of the following statements is wrong about equal-cost routing within an IS-IS network?

Question94: In order to quickly detect network link failures, which of the following protocols can we deploy?

Question95: In MPLS VPNE, in order to distinguish IPV4 prefixes that use the same address space, the IPV4 address is increased by the RD value. Which of the following description is correct? (Multiple choice)

Question96: What is the command to adjust the IS-IS interface link cost value?

Question97: According to this figure, what can we judge? (Multiple choice)

Question98: When configuring the DHCP Relay function on the device, the VLANIF interface of the relay connected to the client must be bound to a DHCP server group, and the bound DHCP server group must be configured with the IP address of the DHCP server to be proxied.

Question99: Which description is correct about the characteristics of a high-availability network? (Multiple choice)

Question100: On the boundary between the enterprise network and the external network, what kind of equipment is generally deployed on the outermost part of the enterprise network.

Question101: Which of the following sequences can be matched by the regular expression 100.S? (Multiple choice)

Question102: IS-IS supports the processing and calculation of IPV6 routes by adding TLVs to carry IPV6 addresses and reachability information.

Question103: An engineer uses two routers to test IPv6 services, and simulates the interconnection between the headquarters and branches by running BGP4+.


As shown in the figure, an engineer captures the packet to view the update message sent by R1. Regarding the description of the message information, which of the following statements is correct?

Question104: ping-a X-c Y-s z-vpn-instance M 10.5.16.2, what is the meaning of this command? (Multiple choice)

Question105: OSPFv2 is an IGP that runs on IPv4 networks. OSPFV3 is an IGP running on IPv6 networks. Compared with OSPFv2, OSPFv3 has similar LSAs, but has slightly different functions.
The following is the description of the LSA function of OSPFV3, please drag the LSA to the correct LSA function column.

Question106: 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 monitor terminal no longer pop up the debug message? (Multiple choice)

Question107: As shown in the figure, OSPF is deployed in a campus, and Area1 is deployed as an NSSA area. By default, R2 will automatically generate a default route of Type7 LSA and flood it in the NSSA area.

Question108: Different virtual machines can use the VTEP tunnel established by vswitchi to communicate with VXLAN. Then the communication process of VXLAN is: 1 The source VTEP encapsulates the ARP broadcast sent by the source VM into a multicast packet and sends it to the L3 network. 2 After receiving the multicast packet, the destination VTEP learns the mapping relationship between the source VM and VTEP, and forwards the multicast packet to the local VM. 3 Local unicast response. 4 The destination VTEP encapsulates the Vxlan tunnel, establishes a mapping table and encapsulates it, and then unicasts it to the source VTEP. 5 The source VTEP receives the response and establishes the mapping relationship between the target VM and the target VEP, removes the tunnel and forwards it to the source VM. 6 The source VM and the target VM communicate unicast packets through the tunnel.

Question109: By executing the command ( ), users on different ports in the same VLAN can be completely isolated at Layer 2 and Layer 3 and cannot communicate. (Please use English lowercase letters to complete the command, and the command cannot be abbreviated)

Question110: In the label forwarding table of the MPLS device, for different routes (the next hop is also different), the label is sent out:

Question111: In an operator's MPLS VPN network, there are two devices PE1 and PE2 for MPLSVPN data forwarding. PE1 receives a private network route of 172.16.1.0/24 from the client, and converts it to a VPNv4 route and distributes it on PE1 Released to PE2 with the label 1027. The outgoing label of the MPLS LSR-ID from PE2 to PE1 is 1025.
When a client on PE2 accesses 172.16.1.0/24, the frame sent by PE2, the inner and outer labels should be the combination of which of the following?

Question112: RR rules for advertising routes violate the rules of IBGP split horizon, so it may cause loops in the AS. What routing attributes does RR use to prevent loops? (Multiple choice)

Question113: In order to advertise IPv6 routes in BGP4+, what fields are added in Update?

Question114: When configuring a RADIUS server template on a Huawei switch, which of the following options are optional configuration parameters?

Question115: In the scenario of multi-level RR, a large number of secondary RRs will be connected to the primary RR, which may cause the BGP routing table of the primary RR to overflow. What method can be used to reduce the risk of overflow of the BGP routing table of the level RR?

Question116: What are the working modes of firewall interfaces? (Multiple choice)

Question117: Which protocol modules can BFD detection be associated with? (Multiple choice)

Question118: What information can be used for complex traffic classification in packets? (Multiple choice)

Question119: As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is advertised in area 0 according to the Loogback0 of R2 as shown in the figure, then in area 1, both R2 and R3 will transmit 10.0 in the form of Typae3 LSA .2.2/32 routing information.

Question120: In the label forwarding table of the MPLS device, for the same route, the incoming label and the outgoing label:

Question121: As shown in the figure.


What can we judge from this figure? (Multiple choice)

Question122: The Router LSA of a certain router is shown in the figure. Which of the following statements is wrong?

Question123: 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.

Question124: When encountering network failures, engineers often use hierarchical fault handling because all models follow the same basic premise, and when all of a model's lower-level structures are working properly, its higher-level structures will work as expected. Please match the following check items to the corresponding levels according to the hierarchical method.

Question125: The preliminary investigation of the cutover project is mainly to communicate and coordinate with customers and other participants, and collect network information for analysis.

Question126: According to this figure, can we judge whether R4 is on?

Question127: As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?

Question128: As shown in the figure, a sham link is established between PE1 and PE2 through the LoopBack0 interface. CE2 can learn the route of network segment 192.168.1.0/24 (the direct route on CE1) through the sham link and the backdoor link. If the default configuration is maintained, the cost of the route from CE2 to network segment 192.168.1.0/24 should be ( ). (Please fill in the Arabic numerals directly, without symbols)

Question129: What traffic can port mirroring mirror? (Multiple choice)

Question130: When encountering a large-scale network cutover project, it can be divided into several relatively independent but related small cutover projects.

Question131: Regarding the BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?

Question132: Basic QinQ can choose the outer tag encapsulation method according to the business type.

Question133: As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to realize network interoperability. R2, R3, and R4 in branch 2 deploy IS-IS to realize network intercommunication.

Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?

Question134: A campus deploys both IPv4 and IPv6 networks for service testing, and runs IS-IS to achieve network interconnection. The IS-IS routing protocol has good scalability and is widely used in the existing network. Which of the following statements is true about IS-IS scalability? (Multiple choice)

Question135: The DHCP protocol can assign some TCP/IP-related parameter information to the client. In this process, DHCP defines a variety of messages. The encapsulation of these messages is?

Question136: When upgrading the device software, which of the following descriptions about the operation window time is wrong?

Question137: Which of the following statements is true about the multicast addresses used by OSPFv3? (Multiple choice)

Question138: Which of the following reasons may cause the hosts in the same VLAN of the local area network to fail to communicate with each other? (Multiple choice)

Question139: According to this figure, what can we judge?

Question140: MPLS has always been slower than IP forwarding.

Question141: When deploying BGPIMPLS IPVPN, when two VPNs have a common site, the common site must not use overlapping address space with other sites of the two VPNs.

Question142: What conditions must eSight meet to receive and manage device and report alarms? (Multiple choice)