EMT Practice Test

1. Question Content...

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Question1: If no security policy is configured between firewall domains, or when searching for a security policy. If all security policies are not matched, the default interzone packet filtering action is executed by default is?

Question2: What is the value of the linkage between OSPF and BFD?

Question3: 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)

Question4: As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?

Question5: 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?

Question6: As long as both parties A and B are present at the project acceptance meeting, no third party is required.

Question7: Which of the following are static information coke analysis? (Multiple choice)

Question8: What information about a packet can be marked or remarked? (Multiple choice)

Question9: 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?

Question10: When the network administrator tried to access the internal network device through Telnet, it was found that it could not be accessed. Which of the following is not the likely cause?

Question11: As shown in the figure, on the R1 router, network administrator A can control the path of traffic entering AS100 after modifying the MED value of the routing entry sent to R2 through the routing policy.

Question12: Which description is correct about the DHCP address pool? (Multiple choice)

Question13: What are the situations in which packet loss may occur? (Multiple choice)

Question14: When a large number of IP phones and WLAN APs need to be accessed in the network, which type of switch is generally considered?

Question15: According to this figure, what can we judge? (Multiple choice)

Question16: What conditions must eSight meet to receive and manage device and report alarms? (Multiple choice)

Question17: The end-to-end delay is equal to the sum of all processing delays and queue delays on the path

Question18: 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)

Question19: What characteristics must a high-risk operating program have? (Multiple choice)

Question20: View the running configuration in memory through display current-configuration.

Question21: According to this picture, what can we judge? (Multiple choice)

Question22: When using Sight to query historical alarms, which of the following conditions can be used to filter alarms? (Multiple choice)

Question23: What information can be used for complex traffic classification in packets? (Multiple choice)

Question24: An engineer uses two routers to test IPv6. He wants to realize the interconnection of IPv6 networks by running OSPFv3. About the OSPFv3 related configuration that needs to be done on R1
, which are correct? (Multiple choice)

Question25: According to this figure, can we judge whether R4 is on?

Question26: What are the reasons why DHCP faces many security threats? (Multiple choice)

Question27: 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.

Question28: When the device is used as an SSH server, a local key pair must be configured.

Question29: After the cutover acceptance is completed, what work still needs to be performed in the closing stage? (Multiple choice)

Question30: Which of the following is the least likely cause of the dual-active failure of the VRRP backup group?

Question31: 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)

Question32: Network administrator A needs to permit or deny some specific routes, but administrator A is not proficient in configuration. Please help administrator A to sort the configurations reasonably so that the device can permit or deny specific routes as required in the figure.

Question33: When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?

Question34: When troubleshooting network faults, you judge and eliminate the root cause of the problem layer by layer in the order of access layer, aggregation layer, and core layer. Which of the following is this method of network troubleshooting?

Question35: If the sticky MAC function is enabled on an interface, what is the number of MAC addresses learned by the interface by default?

Question36: BGP4+ carries the next hop address of the IPv6 route through the Next Hop attribute in the Update packet.

Question37: For the same MAC address, manually configured MAC entries have higher priority than automatically generated entries.

Question38: 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)

Question39: When congestion occurs, which metrics of QoS are usually affected? (Multiple choice)

Question40: As shown in the figure, R1, R2, R3, and R4 are in the same MPLS domain, and LDP is used to distribute MPLS labels between devices. R4 is the Egress LSR of the FEC 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 know the forwarding priority of the data, then the outgoing label of R3 for the FEC should be ( ). (Please fill in the Arabic numerals directly, without symbols)

Question41: 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?

Question42: 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)

Question43: 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 Sub-VLANs It not only includes physical connection, but also can establish a three-layer VL ANIF interface, which can directly communicate with the external network at three-layer.

Question44: A campus has deployed IPv6 for service testing. In the initial stage of deployment, engineers wanted to achieve network interoperability through IPv6 static routes. When creating an IPv6 static route. You can specify both the outbound interface and the next hop, or only the outbound interface or only the next hop.

Question45: Configure IS-IS IPv6 enable on the interface. What is the meaning of this command?

Question46: Which of the following descriptions about the LDP Sessioni establishment process is correct? (Multiple choice)

Question47: 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)

Question48: A router runs OSPF, and the output information is shown in the figure. Which of the following statements is correct?

Question49: According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?

Question50: In OSPF, ABR converts all Type 7 LSAs in the NSSA area to Type 5 LSAs.

Question51: The information collection before the cutover can be used to judge whether the services before and after the cutover are normal.

Question52: In BGP/MPLS IP VPN, OSPF multi-instance process uses DN bits to prevent Type5 LSA loops.

Question53: The dynamic IP address assigned to the client by the DHCP server. Usually there is a certain rental period, which of the following description of the rental period is wrong?

Question54: Suppose there are four flows a.b.c.d of 50M respectively, the total port bandwidth is 100M, traffic congestion occurs, and congestion management is performed on them. Among them, traffic a belongs to PQ queue scheduling, traffic b.c.d belongs to WFQ queue scheduling, and the weight ratio is 1:2:2. Which descriptions are wrong about the scheduling results for the four types of traffic? (Multiple choice)

Question55: In the NFV architecture, what are the specific underlying physical devices? (Multiple choice)

Question56: Which statement is true about ASPF and Server-map? (Multiple choice)

Question57: IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection, of which R2 only supports IPv4.

Which of the following statements is true about the topology calculation of this network?

Question58: The security protection actions that can be performed by a secure MAC address do not include which of the following?

Question59: On Monday morning, you get a call from your office desk, an employee says he can't access the internet from his PC and wants your technical support. So you tested it with the ping command on his PC, and used the tracert command to see where the packet loss occurred.
Which of the following is this network troubleshooting method?

Question60: 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 about the two layers of labels is wrong? (Multiple choice)

Question61: Which descriptions about the MPLS forwarding mechanism are correct? (Multiple choice)

Question62: Which of the following description is wrong? (Multiple choice)
[LSRA]pls Isr-id1.1.1.9[LSRA]mpls[LSRA]interface vlanif10[LSRA-Vlanif10]mpls[LSRA-Vlanif10]quit[LSRA]static-Lsp ingiess SAtoSD destination 4.4.4.9 32 nexthop 10.1.1.2 out -label 20

Question63: VXLAN uses Mac in TCP encapsulation to encapsulate Layer 2 packets with Layer 3 protocols.

Question64: BFD is only a general fast detection technology, which can realize fast switching function by itself, and it is not necessary to use it together with other fast switching technologies.

Question65: The three authorizations required for high-risk operations do not include:

Question66: The three basic characteristics of an SDN network architecture are:

Question67: Which of the following description of the configuration on this switch is correct? (Multiple choice)

Question68: Which of the following information can the DHCP binding table contain? (Multiple choice)

Question69: Which of the following statements about MUX VLANs are true? (Multiple choice)

Question70: What can we infer from this graph? (Multiple choice)

Question71: Which of the following statements about the endpoint security management features of Agile Controller are correct? (Multiple choice)

Question72: Among the following options, which of the following descriptions is wrong?

Question73: What check items can be set by IPSG? (Multiple choice)

Question74: When Mr. Wang unpacked and inspected the goods, he found that the appearance of the equipment was not damaged, and all the modules of the equipment were running normally when the power was first turned on, but after 24 hours of continuous operation, the board failed, then this situation is not eligible for the DOA process.

Question75: 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)

Question76: Compared with the OSPFv2 packet header, what is the field added in the OSPFv3 packet header?

Question77: When troubleshooting MSTP, you executed the display current-configuration command to obtain the configuration file of the device. Which of the following statements is false?

Question78: 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.

Question79: The output information of a router is as follows. Which of the following causes the OSPF adjacency cannot be established normally? (Multiple choice)

Question80: Which of the following statements is true about BGP4+? (Multiple choice)

Question81: Which of the description of business priority in DSCP is correct?

Question82: What traffic can port mirroring mirror? (Multiple choice)

Question83: Which of the following description of the Confirm Failure phase in the Structured Network Troubleshooting Process is correct?

Question84: When troubleshooting TELNET login failure, which step should be done first?

Question85: 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)

Question86: 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)

Question87: According to this figure, what can we judge?

Question88: The information security system is the interaction of ( ), ( ), and ( ). (Multiple choice)

Question89: In addition to the virtual connection, what type of IPv6 address is the source IPv6 address of the Hello packet of OSPFv3?

Question90: Which of the following statements about the OSPFv3 packet format is correct? (Multiple choice)

Question91: The LSR retains the received label, and there are several ways to retain it. Which of the following statements about the free way of LDP label retention is correct? (Multiple choice)

Question92: Which of the following descriptions about the terminal security management features of Agile Controller is correct? (Multiple choice)

Question93: 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.

Question94: All routers run OSPF as shown.

Which of the following statements is correct?

Question95: The IS-IS Leve1-1 neighbor between R3 and R4 is not established. What is the possible reason based on the information in this figure?

Question96: As shown in the figure, OSPF is enabled on all interfaces of the router. The ip address marked in the figure is the IP address of the loopback0 interface. The Loopback0 of R1, R2, and R3 is advertised in area 1, and the Loopback0 of R4 is advertised in area 0, Loopback0 of R5 announces which of the following functional addresses in area 2 can ping each other?

Question97: Basic QinQ can choose the outer tag encapsulation method according to the business type.

Question98: OSPF is deployed in a campus to implement network interconnection, and OSPF is also enabled on the GE0/0/2 interface of R3. Area1 is deployed as an NSSA area, and the device addresses are shown in the figure.

An engineer configures a static route on R3 to access the loopback interface address of R4, and imports the static route in the OSPF process.
At this time, in the Type5LSA received by R1, the forwarding address (FA) is ( ). (Note: Please fill in the IP address without mask)

Question99: Regarding the content of network security optimization, which of the following options is incorrect?

Question100: In MPLS network, there are different operation types for labels, among which the meaning of "pop" action is?

Question101: By default, the Domain ID of each OSPF process running on the router is the same as the process ID of the process, which can be modified by the domain-id command under the process.

Question102: 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:

Question103: 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.

Question104: Regarding MP-BGP, which of the following descriptions is wrong?

Question105: 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)

Question106: Routing protocols can detect failures through Hello packets, so BFD is not required.

Question107: Which of the following commands can be used to view information about BGP VPNV4 routes and BGP private network routes on PE?

Question108: Which of the following statements about IPSG is false?

Question109: R1 performs operation ping-a 10.1.1.1 10.5.16.2, what is the meaning of this command?

Question110: In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain the labels distributed by all LDP peers, regardless of whether the LDP peer is the optimal next hop to the destination network segment.

Question111: 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.

Question112: The session-based stateful inspection firewall has different processing flows for the first packet and subsequent packets. Which of the descriptions of the flow is correct? (Multiple choice)

Question113: 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.

Question114: According to this picture, what can we judge? (Multiple choice)

Question115: 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?

Question116: The Router LSA of a certain router is shown in the figure. Which of the following statements is wrong?

Question117: Please match the OSPFv3LSA with its delivery range.

Question118: Please match the command with the function implemented.

Question119: 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)

Question120: DHCP Server is the DHCP server, which is responsible for allocating IP addresses of clients. When configuring DHCP Servert, which of the following steps need to be included? (Multiple choice)

Question121: Since BGP is an EGP routing protocol, BGP routing policies can only be deployed between EBGP neighbors. Deploying routing policies between IBGP neighbors is invalid.