EMT Practice Test

1. Question Content...

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Question1: The figure shows the debugging information on an OSPF router. Which of the following is the router ID of this router?

Question2: On the OSPFv3 network shown in the figure, area 1 is a common area. Which of the following statements are true?

Question3: An administrator runs the display mpls Isp command to view LSPs on a device. The command output is shown in the figure. Which of the following statements are true?

Question4: On the OSPF network shown in the figure, R1 and R2 use OSPF to communicate with each other through Loopback0. In addition:
* MPLS LDP is enabled on R1 and R2.
* The LDP transport address is the IP address of Loopback0.
* A network engineer finds that an LDP session cannot be established between R1 and R2 and runs diagnostic commands (shown in the figure) to locate the fault.
Given this, which of the following are possible causes of the fault?

Options:

Question5: On the network shown in the figure, SW3 is the user gateway and DHCP relay agent.
The administrator plans to configure DHCP snooping on SW3 to prevent DHCP attacks.

Which of the following commands does not need to be configured on SW3?

Question6: On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command. R3 is configured with the peer y.y.y.y as-path-filter 1 import command for all peers. Which of the following sets of commands enables R3 to select the route with the longest AS_Path to 192.168.1.0/24?

Question7: On the OSPF network shown in the figure, the cost values of links are marked, and OSPF IP FRR is enabled on R1. Which of the following statements are true?

Question8: The path that IP packets pass through on an MPLS network is called a label switched path (LSP). An LSP is a bidirectional path that specifies the transmission direction of data flows.

Question9: MPLS supports nesting of multiple labels. After receiving an MPLS packet, a device first processes the label next to the Layer 2 header, that is, the top MPLS label.

Question10: As shown in the figure, R1 to R4 are four routers in AS123. They all run OSPF to implement route reachability within the AS.
* Network segments 10.1.1.0/24 and 10.4.4.0/24 are not advertised into OSPF.
* R1 and R4 establish an IBGP peer relationship using Loopback0 and advertise network segments
10.1.1.0/24 and 10.4.4.0/24 into BGP.
Which of the following methods can be used to implement communication between PC1 and PC2?

Options:

Question11: R1 forwards a packet with the destination IP address of 4.4.4.4 on an MPLS network.
* Some LSP (Label Switched Path) information of R3 is shown in the figure.
* During packet transmission, which of the following devices perform MPLS label operations?

Question12: The figure shows the logical network architecture of a migration project. The purpose of the migration is to enable terminals in different geographical locations to communicate with each other and deploy the gateway of the terminals on the PE routers.
After the migration is complete, which of the following methods can be used by network engineers to preliminarily check the network connectivity?

Options:

Question13: There are multiple types of MAC address entries on a switch. Which of the following entries are manually configured and cannot be aged out?

Question14: On the network shown in the figure, VRRP is configured on Rl and R2, and the virtual IP address is
10.0.12.254. After the configuration is complete, the network engineer checks the VRRP status on R1 and R2, and finds that both devices are in the Master state. Which of the following is not a possible cause of this problem?

Question15: On the OSPF network shown in the figure, area 1 is a stub area, area 2 is a totally stub area, and area 3 is an NSSA. Which of the following routers are unable to import external routes?

Question16: For high reliability purposes, the following LDP messages are transmitted through TCP: discovery messages, session messages, advertisement messages, and notification messages.

Question17: OSPFv3 packets are encapsulated in IPv6 packets. Which of the following is the value of the Next Header field in the IPv6 packet header?
Options:

Question18: A network engineer enters dir on the device to obtain the following file names. Which is most likely to be the version file of the device?

Question19: During an attempt to log in to a NetEngine AR6120 through the console port, the network engineer finds that the password is incorrect and the login fails. If a Telnet account can be used to log in to the device and the account has the permission to change the console port password, the network engineer can log in to the device through Telnet to change the console port password.

Question20: On the OSPFv3 network shown in the figure, OSPFv3 is enabled on the interfaces connecting R1, R2, and R3. The router ID of each router is 10.0.X.X, where X is the number of the router.
If you check detailed information about an LSA on R3, the command output shows that R1 and R2 are DRs on the network.
Options:

Question21: On the OSPFv3 network shown in the figure:
* Area 1 is a stub area, Area 2 is a common area, and Area 3 is an NSSA (Not-So-Stubby Area).
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.
* The stub no-summary command is configured in Area 1 on R2.
Which of the following statements is true?

Question22: On the OSPF network shown in the figure, area 1 and area 2 are common areas. The IP address of Loopback0 on R5 is 10.0.5.5/32, and OSPF is enabled on this interface. If the abr-summary 10.0.5.0
255.255.255.0 command is run in area 2 (where R1 resides), which of the following routers have the route
10.0.5.0/24 in their routing tables?

Question23: BFD for OSPF refers to the association of BFD with OSPF to speed up OSPF's response to network topology changes. The OSPF neighbor relationship can enter the Full state only after the BFD session goes up. The OSPF neighbor relationship can go down only after the BFD session goes down.

Question24: A network engineer checks LLDP neighbor information on R1. The output is shown below.
Which of the following statements are true?
LLDP Output:
yaml
CopyEdit
<R1> display lldp neighbor interface GE0/0/0
------------------------------------------------
GE0/0/0 has 1 neighbor(s):
Neighbor index: 1
Chassis type: MAC Address
Chassis ID: faed-ad04-0010
Port ID subtype: Interface Name
Port ID: GE0/0/0
System name: R2
System description: Huawei YunShan OS
Version 1.22.01 (AR8000 V100R002C200)
Copyright (C) 2021-2022 Huawei Technologies Co., Ltd.
HUAWEI AR8140-12G10XG
System capabilities supported: bridge router
System capabilities enabled: bridge router
Management address type: IPv4
Management address: 192.168.1.1
Expired time: 107s

Question25: On the IS-IS IPv6 network shown in the figure, multi-topology is enabled on all routers. The IPv6 address of Loopback0 on R4 is 2000::/128. The IPv6 summary 2000::/64 level-1-2 command is configured in the IS-IS processes of R2 and R1. Which of the following statements is false?

Question26: As shown in the figure, an administrator enables port isolation on the switch's interfaces connected to terminals.

In this scenario, which of the following IP addresses cannot be pinged from PC1?

Question27: In CE multi-homing scenarios, if BGP AS number substitution is enabled on PEs, you can run the peer soo command on the EBGP peers of the PEs and CE to configure the Site of Origin (SoO) attribute to prevent loops.

Question28: Which of the following is not included in OSPF Hello packets?
Options:

Question29: On the OSPF network shown in the figure, a network engineer finds that R1 and R2 have the same router ID, and both have imported default routes (with the default-route-advertise always command configured). Given this, which of the following statements is false?

Question30: On the network shown in the figure, the DHCP server function is enabled on GE0/0/0 of R2, and the address pool is an interface address pool.
When GE0/0/0 and GE0/0/1 of R1 function as DHCP clients, only one interface can obtain an IP address by default.

Options:

Question31: On the OSPFv3 network shown in the figure, the LSDB of R2 contains ____ Router-LSAs. (Enter only digits.)

Question32: IS-IS LSP fragments are identified by the LSP Number field in their LSP IDs. This field is 4 bits long.
Therefore, an IS-IS process can generate a maximum of 256 LSP fragments, which means only a limited amount of information can be carried. By adding additional system IDs, you can enable the IS-IS process to generate more LSP fragments.
Options:

Question33: An OSPFv3 NSSA LSA is generated by an ASBR, describes routes to a destination outside the AS, and is advertised in an NSSA.
Options:

Question34: An interface of a switch is in error-down state. A possible cause is that the average rate of broadcast packets received by the interface exceeds the upper threshold set by the administrator for storm control.

Question35: On the OSPF network shown in the figure, area 1 is an NSSA, area 2 is a stub area, and R4 imports an external route 10.0.4.4/32. The router ID of each router is 10.0.X.X, where X is the router number. The asbr-summary 10.0.4.0 255.255.255.0 command is configured in the OSPF processes of R1 and R3.
Match the following descriptions of routing tables with the corresponding routers:

Question36: As its network scale expands, an enterprise plans to move scattered servers to the same equipment room for unified management. During hardware migration, network engineers do not need to perform device commissioning and therefore do not need to work out a migration solution.

Question37: On the OSPF network shown in the figure, R1 and R2 are connected through four links. OSPF is enabled on Loopback0 of R2, and the maximum load-balancing 1 command is run in the OSPF process of R1. Which of the following is the outbound interface from R1 to Loopback0 of R2?

Question38: On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following statements are true?

Question39: R1 and R2 use directly connected interfaces to establish an EBGP peer relationship. R1 imports 2000:: 1/128 to BGR By default, which of the following is the next hop of the route from R2 to 2000:: 1/128?

Question40: Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?

Question41: On the network shown in the figure, single-hop BFD is configured on R1 and R2.
A network engineer finds that the BFD session goes down. To locate the fault, the network engineer queries the BFD configurations on R1 and R2.
According to the configuration information marked in the figure, it can be determined that mismatched time parameter settings on R1 and R2 cause the BFD session to go down.

Is this statement TRUE or FALSE?

Question42: On an enterprise network shown in the figure, if CE2 is dual-homed to PE2 and PE3, a routing loop may occur during the exchange of Type 5 LSAs (External LSAs in OSPF).
To prevent the loop, the route-tag command can be run on PE2 and PE3.
In this way, if the route tag of the route received by PE3 is the same as that configured locally, the route is ignored.

Is this statement True or False?

Question43: On a stable network that requires fast route convergence, you can change the value of the interval at which OSPF LSAs are updated to 0 so that topology or route changes can be immediately advertised on the network through LSAs, which speeds up route convergence.

Question44: BGP allows you to use the filter-policy acl-number import command to filter received routes. The value of ad- number ranges from 2000 to 3999.

Question45: On the IS-IS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. Which of the following routers have the default route in their routing tables?

Question46: If technology migration on the network affects the services running on the live network, strictly follow the preset operation process and risk control measures during the implementation of the technology migration project. Generally, this type of project is defined as a migration project. Which of the following operations performed on the live network belongs to a non-migration project?

Question47: On the OSPF network shown in the figure, area 1 is a common area, area 2 is a stub area, and area 3 is an NSSA. R5 imports an external route 10.0.5.5/32. Given this, which of the following routers does not have the route 10.0.5.5/32 in its routing table?

Question48: To protect a device against the attacks of forged BGP messages, you can configure GTSM to check whether the TTL value in the IP message header is within the specified range. If the peer x.x.x.x valid-ttl-hops 100 command is configured on a device, the valid TTL value range of the detected message is [155, 255].

Question49: On the OSPFv3 network shown in the figure, area 1 is a stub area.

Which of the following LSAs is generated by only one router?

Question50: On the OSPF network shown in the figure, areas 1, 2, and 3 are common areas. The IP address of Loopback0 on R5 is 10.0.5.5/32, and OSPF is enabled on the interface using the network command.
ACL 2000 (with the matching rule shown in the figure) is configured on all routers. If the command filter
2000 import is run in area 0 (where R1, R2, and R3 reside), which of the following routers do not have the route 10.0.5.5/32 in their routing tables?

Question51: On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are RRs (Route Reflectors), and R1, R4, R3, and R6 are clients. The iBGP peer relationships are established using Loopback0 on each router, and the router ID is 10.0.0.X/32, where X is the number of the router. R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import- route command. Which of the following statements are true?

Question52: In the preparation phase of a migration project, the software and hardware need to be checked. Match the operation objects in the preparation phase with the corresponding operation contents.

Question53: On the OSPF network shown in the figure:
* Area 1 is a common area.
* Area 2 is a totally NSSA (Not-So-Stubby Area).
* Area 3 is an NSSA.
* R5 imports the external route 10.0.5.5/32 into OSPF.
Which of the following routers have the route 10.0.5.5/32 in their routing tables?

Question54: On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2 and R5. In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are RR (Route Reflectors), and R1, R4, R3, and R6 are the iBGP peer relationship clients. The iBGP peer relationship ID is 10.0.0.X/32, where X is the number of the iBGP router. R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route
192.168.2.0/24 to BGP through the import-route command. Which of the following statements are true?

Question55: VLAN aggregation is configured on a switched network. Sub-VLAN 2 and Sub-VLAN 3 are added to Super-VLAN 10.
To enable hosts in different Sub-VLANs to communicate with each other, run the _____ inter-sub-vlan- proxy enable command in the view of VLANIF 10, corresponding to the Super-VLAN.
(Enter the answer in lowercase letters only.)

Question56: On the network shown in the figure, PC1 and PC2 are connected to the same switch (SW1) and belong to the same VLAN.

Which of the following are possible causes of a communication failure between PC1 and PC2?
Options:

Question57: On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces.
* The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router.
* Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command.
* The aggregate 192.168.1.0/16 detail-suppressed command is configured on R2.

Which of the following is the path for traffic from R3 to 192.168.1.0/24?

Question58: After port isolation is configured on a switch, hosts in the same VLAN cannot communicate with each other at Layer 2 or Layer 3 by default.

Question59: A network device has established an OSPF neighbor relationship with another device. The figure shows the configuration of GE0/0/0 on the network device.

Which of the following commands would NOT affect the OSPF neighbor status of the interface?

Question60: On a BGP/MPLS IP VPN network, VPNv4 routes carry the export RT. Which of the following attributes is used by MP-BGP to carry the export RT?

Question61: On the OSPFv3 network shown in the figure:
* Area 1 is a stub area
* Area 2 is a common area
* Area 3 is an NSSA
* The IPv6 address of Loopback0 on R6 is 2000::6/128.
* The router ID of each router is 10.0.X.X, where X is the router number.

Which of the following statements are true?

Question62: A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where:
* R1 and R2 both have OSPF enabled.
* R1 and R2 function as the gateways for PC1 and PC2, respectively.
Given this, which of the following statements are true?

Options:

Question63: A network engineer obtains a multicast data frame whose destination MAC address is 01-00-5e-00-01-01.
Given this, which of the following cannot be the destination IPv4 address of this frame?
Options:

Question64: Both VLAN aggregation and MUX VLAN are deployed on the enterprise network shown in the figure, and all switch interfaces connected to terminals are access interfaces. Given this, match PCI to PC4 with the hosts or servers that they can access on the network. (Note: A host cannot be matched with itself. For example, PCI cannot match PCI.) (Tokens can be reused.)

Question65: OSPFv3 runs on R1 and R2, and the IPv6 addresses configured for the interfaces are marked in the figure.
The router IDs of R1 and R2 are 10.0.1.1 and 10.0.2.2, respectively.

Which of the following statements is true?

Question66: In the figure, a network administrator configures a static LSP to implement MPLS data forwarding. The lower part of the topology shows the packet header information obtained from a device.
Which of the following statements are true?

Options:

Question67: Which of the following is not included in OSPF Hello packets?
Options:

Question68: On the OSPF network shown in the figure, drag the values on the left to the correct positions so that:
* Traffic from PC1 to PC2 follows the path:PC1 -> R1 -> R3 -> R2 -> PC2
* Traffic from PC2 to PC1 follows the path:PC2 -> R2 -> R1 -> PC1
Which of the following OSPF cost values should be assigned to Cost-A, Cost-B, and Cost-C to achieve this routing behavior?

Question69: On the network shown in the figure, OSPF is deployed on R1 and R2. IS-IS is deployed on R2 and R3. To enable R1 to obtain the route to 10.0.3.3/32, ISIS routes are imported into OSPF on R2. In this case, the next hop address to 10.0.3.3/32 in the routing table of R1 is_____.

Question70: Which of the following TLVs is added to IS-IS to support multi-topology?

Question71: I-SPF and PRC can speed up ISIS route convergence. PRC does not calculate nodes. Instead, it updates routes based on the shortest path tree (SPT) calculated using the SPF algorithm.

Question72: A network engineer enters dir on the device to obtain the following file names. Which is most likely to be the version file of the device?

Question73: On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2.
In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are Route Reflectors (RRs), and R1, R4, R3, and R6 are clients.
An iBGP peer relationship is established between R2 and R5, and the same cluster ID is configured. The iBGP peer relationships are established using Loopback0. The IP address of Loopback0 on each router is 10.0.X.X/32, where X is the router number.
R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command.

Which of the following statements are true?

Question74: OSPF requires that routers in the same area have the same link state database (LSDB). As the number of routes on the network increases, some routers cannot carry so much routing information due to limited system resources. This state is called database overflow. If the Isdb-overflow-limit number 7 command is run on all routers on an OSPF network, which of the following conditions are likely to cause routers to enter the overflow state?

Question75: On the network shown in the figure, IS-IS IPv6 runs on R2, R6, and R3, and the IPv6 address of Loopback0 on R6 is 2000::6/128. OSPFv3 runs on other links. Area 1 is a stub area, and Area 2 is an NSSA. IS-IS routes are imported to OSPFv3 on R2 and R3. Which of the following statements are true?

Question76: On a BGP/MPLS IP VPN network, which of the following are carried when a PE advertises VPNv4 routes?

Question77: On the network shown in the figure, an administrator first completes the routing configuration and then enables MPLS and LDP on R1, R2, and R3 and their interconnected interfaces. In this manner, traffic from PC1 to PC2 can be forwarded based on MPLS. Which of the following routing configurations can implement this function?

Options:

Question78: On the network shown in the figure, the DHCP server function is enabled on GEO/0/0 of R2, and the address pool is an interface address pool. When GEO/0/0 and GEO/0/1 of R1 function as DHCP clients, only one interface can obtain an IP address by default.