EMT Practice Test

1. Question Content...

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Question1: Which of the following statements regarding an IP prefix are true?

Question2: An ACL can be used to match routes or data, but cannot be used to match both the IP address prefix length and mask length.

Question3: To prevent loops on an STP network, after a designated port is elected, it must wait for a long time and can forward packets only after the status of all ports on the entire network is determined. To solve this problem, RSTP uses the P/A mechanism to speed up the downstream port's transition to the Forwarding state.

Question4: An enterprise administrator wants to configure single-hop BFD to implement fast detection of direct links.
Which of the following configurations are mandatory?

Question5: A monitoring plane usually comprises the monitoring units of main control boards and interface boards. This plane can monitor the system environment independently. Which of the following environment monitoring functions can be provided by the monitoring plane?

Question6: Which of the following fields in DD packets is used for implicit acknowledgment to ensure the reliability and integrity of DD packet transmission on an OSPF network?

Question7: A local router runs IS-IS and its command output is shown in the following figure. Which of the following statements is true?

Question8: On an OSPF network, if the network type is NBMA, a router unicasts all protocol packets; if the network type is broadcast, a router multicasts all protocol packets.

Question9: A non-client is an IBGP peer that functions as neither an RR nor a client. A non-client must establish fully meshed connections with the RR and all the other non-clients.

Question10: On an RSTP network, port priorities may be compared during root port or designated port election. Which of the following values is the default priority of a port on a Huawei switch?

Question11: In IPsec, an SA (Security Association) is uniquely identified by three parameters. Which of the following parameters does not belong to the 3-tuple information?

Question12: There are two types of routing entries on a PIM network. (S, G) routing entries are used to set up on a PIM network and are applicable to both PIM-DM and PIM-SM networks.

Question13: What parameters can a DHCP6 server assign to a DHCPv6 client?

Question14: After a BGP peer relationship is established between two ends, changing the router ID of one end resets the BGP peer relationship.

Question15: When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?

Question16: A Layer 2 switch supports multiple types of Ethernet interfaces. Similar to a trunk interface, a hybrid interface allows data frames from multiple VLANs to pass through. In addition, you can determine whether data frames from a VLAN sent out from a hybrid interface are tagged or untagged.

Question17: In the OSPF protocol, inter-area route calculation involves only Router LSA, Network LSA, and Summary LSA.

Question18: If a router ID is configured in both the system via and the BGP view, BGP uses the router ID configured in the BGP view because the BGP view takes precedence over the system view.

Question19: A large shopping mall configures a VLAN pool to prevent network performance deterioration caused by potentially large broadcast domains. A network engineer runs the display vlan pool name STA command to check information about the VLAN pool. The following command output is displayed:
<AC> display vlan pool name STA Name : STA Total : 2 Assignment: hash Threshold Notify Count: 3 Threshold Notify time(min): 3 VLAN ID : 2 4 Which of the following statements are true?

Question20: Multicast applies to any point-to-multipoint data transmission. Which of the following types of application data can be forwarded in multicast mode?

Question21: Compress the 2001:0DBB:B8:0000:C030:0000:0000:09A0:CDEF address.___________(if the answer contains letters, capitalize them.)

Question22: On a network, some switches are enabled with RSTP and some switches are enabled with STP. What will happen?

Question23: When IPv4 unicast packets are transmitted over Ethernet, their destination MAC address is also a multicast MAC address. If the IP address of a multicast group is 224.0.1.1, which of the following is the corresponding multicast MAC address?

Question24: Multiple BGP processes cannot be configured on the same router.

Question25: On a P2P IS-IS network, after a neighbor relationship is established between R1 and R2, R2 finds that its LSDB is not synchronized. Then, R2 requests corresponding LSPs from R1 for LSDB synchronization. The following figure shows the synchronization process. Drag the following packet types to the steps in which they are used.(Token is reusable)

Question26: Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. R1 and R2 are connected through a PPP link, and R3 is the DIS. Which of the following statements are true?

Question27: Match the following IPv4 multicast protocols with the corresponding functions.

Question28: There are two BFD operating modes. In_______mode, the local end sends BFD Control packets at specified intervals, and the remote end checks whether the local end periodically sends BFD Control packets. (Use lowercase letters.)

Question29: The traffic limiting policy feature only supports the number of connections initiated by the specified IP or the number of connections received.

Question30: SSH is a secure protocol that establishes tunnels for users on insecure networks. Which of the following statements is false about SSH login?

Question31: In BGP, Notification messages are used to request peers to resend routing information after routing policies are changed.

Question32: Which of the following scenarios is not suitable for deploying interface PBR?

Question33: On an OSPF network, one router with P2P as the network type is directly connected to another router with P2MP as the network type. If the Hello intervals on the two routers are changed to be the same, neighbor relationship establishment and LSDB synchronization are not affected.

Question34: When a BGP device sends an Open message to establish a peer connection, which of the following information is carried?

Question35: Which of the following TLVs is used by ISIS to describe the IP address of an interface?

Question36: BFD for OSPF is deployed on a directly connected link. If the physical link is disconnected, drag the following BFD processes to the corresponding sequence numbers.

Question37: Which three transmission modes are supported for IPv4 packets?

Question38: Which of the following statements about stack split is false?

Question39: In IP multicast, RPF routes can be elected only from among unicast routes and multicast static routes.

Question40: Typically, a protocol that occupies two ports during communication is called a multi-channel protocol.
For such protocols, the ASPF function must be enabled on the firewall to ensure smooth setup of the data channel and reduce the risk of attacks. Which of the following protocols is not a multi-channel protocol?

Question41: On an RSTP network, if a port receives an RST BPDU and finds that its buffered RST BPDU is superior to the received RST BPDU, the port discards the received RST BPDU without responding.

Question42: Which of the following statements regarding the MED value in BGP are true?

Question43: What is the correct procedure for a VLAN pool to assign terminals to VLANs.

Question44: IGMPV3 not only supports IGMPv1 General Query and IGMPv2 Group-Specific Query, and also IGMPv3 Source/Group-Specific Query.

Question45: Which of the following PIM protocol packets have unicast destination addresses.

Question46: In BGP, the MED attribute is transmitted only between two neighboring ASs. The AS that receives the MED attribute does not advertise it to a third AS. By default, a router compares only the MED values of BGP routes from the same neighboring AS. That is, if two routes to the same destination are from different neighboring ASs, the router does not compare the MED values of the two routes.

Question47: On an OSPF network, LSDBs are used to store LSAs. Common LSAs include router LSAs and network LSAs. Which of the following items is not included in the 3-tuple that is used to uniquely identify an LSA?

Question48: Which of the following is the default interval at which the DIS on a broadcast IS_IS network sends CSNPs.

Question49: As shown in the figure, SWA, SWB, SWC, and SWD run the Rapid Spanning Tree Protocol (RSTP). Which of the following statements are true?

Question50: In the VRP, by default, the routes imported by BGP will be automatically summarized.

Question51: The typical characteristics of the AI era are that it focuses on data, explores data value, and improves AI efficiency. Therefore, the core requirement of AI for data center networks is speed, meaning low latency.

Question52: To prevent inter-area routing loops, OSPF does not allow advertising routing information between two non- backbone areas and allows sing routing information only within an area or between the backbone area and a non-backbone area. Therefore, each ABR must be connected to the backbone area.

Question53: By default, if no router ID is configured but multiple loopback interface addresses are configured, BGP selects the largest loopback interface address as the router ID.

Question54: Which of the following is used as the destination port for single-hop BFD?

Question55: NETCONF is a network configuration protocol that automates network configuration in a programmable manner, simplifying and accelerating network service deployment. Which of the following operations can be performed by using this protocol?

Question56: IPv6 defines multiple types of addresses. Which of the following statements is false about these addresses?

Question57: Which of the following statements about BFD operating modes are true?

Question58: Which of the following statements regarding the LSA age field are true?

Question59: Which of the following statements are true about IP multicast service models?

Question60: On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes. Which of the following values is the default DIS priority of an IS-IS interface?

Question61: An engineer sets the CAPWAP heartbeat detection interval to 20 of the active link before an active/standby switchover occurs?

Question62: In a route-policy, which of the following BGP attributes can be used in apply clauses?

Question63: A router forwards traffic based on a FIB table. Which of the following values of the Flag field in a routing entry indicates that the next hop of the route is the gateway?

Question64: Compared with RSTP, which of the following port roles are added to MSTP?

Question65: On an IS-IS network, the length and components of a NET are the same as those of an NSAP. Which of the following NET fields is used to uniquely identify a host or router in an area?

Question66: BGP itself does not discover routes. Therefore, other routes need to be imported to the BGP routing table for route exchanges between ASs. In import mode, routes are imported to the BGP routing table by protocol.
Which of the following routes can be imported to the BGP routing table using the import mode?

Question67: BFD control packets are encapsulated in UDP packets for transmission. What is the destination port number of multi-hop BFD control packets?

Question68: Which of the following statements regarding the BGP error display of a router is false?

Question69: Which of the following values is the Reserved/Circuit Type field in the IIH packets sent by a Level-1-2 router on an IS-IS network?

Question70: Which of the following statements is false about the session table mechanism on firewalls?

Question71: On an OSPF network, all OSPF routers generate Router LSAs. If the E bit in a Router LSA is set to 1, the router that generates this LSA is a/an ______.

Question72: On a BGP network, a route-policy can be used to modify route attributes. Which of the following statements is false about route-policies?

Question73: On an RSTP network, port roles are optimized to overcome the disadvantages of STP. Which of the following port roles are supported in RSTP?

Question74: Regarding the route-policy set-cost configuration below, which of the following statements is true?

Question75: On an IS-IS network, routers send LSPs to exchange link state information. LSPs are classified into Level-1 LSPs and Level-2 LSPs and have the same format. Which of the following parts constitute the LSP ID in an LSP?

Question76: Which of the following statements regarding different LSA types is false?

Question77: See the network shown in the following figure.

R1 and R2 run IS-IS and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2. Which of the following statements are true?

Question78: To overcome the disadvantages of STP, RSTP changes the format of configuration BPDUs. Which of the following fields in STP BPDUs is used to specify the port role?

Question79: IGMPv2 uses the timeout mechanism for group members leaving a group. Group members can only leave a group silently. Before the timeout period expires, multicast traffic is still forwarded by the multicast router, and this is a defect.

Question80: On the OSPF network shown in the figure, an adjacency has been established between R1 and R2. An engineer configures the commands in the figure on R2. In this case, which of the following routing entries may exist in the routing table of R2?

Question81: This configuration is part of RTA configuration. Which of the following statements regarding the configuration are true?
[RTA] ospf 100
[RTA-ospf-100]silent-interface GigabitEthernet 1/0/0

Question82: During routine O&M, the administrator checks the IGMP configuration on a router interface. The configuration is as follows:
<RTA> display igmp interface
Interface information of VPN-Instance: public net
GigabitEthernet0/0/1(192.168.1.1):
IGMP is enabled
Current IGMP version is 2
IGMP state: up
IGMP group policy: none
IGMP limit: -
Value of query interval for IGMP (negotiated): -
Value of query interval for IGMP (configured): 60 s
Value of other querier timeout for IGMP: 0 s
Value of maximum query response time for IGMP: 10 s
Querier for IGMP: 192.168.1.1 (this router)
Given this, which of the following statements are true?

Question83: GRE is a VPN technology that can implement packet transmission over heterogeneous networks. Which of the following statements are true about GRE?

Question84: On an OSPF network, Type 7 LSAs can be generated only by ASBRs in NSSAs or stub areas and describe AS-external routes.

Question85: L2TP does not provide security encryption. Therefore, other security measures, such as IPsec, are required to ensure the security of the entire tunnel for data transmission.

Question86: On an OSPF network, there are multiple types of packets, each with a different function. Which of the following are the main functions of Hello packets?

Question87: OSPF has several types of special areas, which are used to reduce the LSDB size and improve device performance.
Which of the following LSAs cannot be in a totally stub area?

Question88: On a WLAN, the HSB service sets up an HSB channel between two devices that back up each other, maintains the channel status, and backs up data. Which of the following can HSB back up in real time?

Question89: Which of the following statements regarding OSPF is true?

Question90: OSPF neighbors have multiple states, such as Down, Init, 2-way, Loading, or Full. In which of the following states do OSPF routers negotiate the master and slave roles?

Question91: RSTP provides different functions in different scenarios. Which of the following statements Is false?

Question92: A large enterprise deploys a WLAN in VRRP HSB mode to ensure WLAN reliability. Which of the following statements are false about the VRRP configuration?

Question93: On an IS-IS network, areas are divided by router, and a router can belong to only one area. Therefore, an IS-IS router only needs to maintain the LSDB of its area.

Question94: Which of the following statements about multicast packet forwarding is true?

Question95: In IP multicast transmission, packets are transmitted from a source to a group of receivers. Which of the following statements are true about IP multicast technologies?

Question96: During routine operation and maintenance, an engineer checks the IGMP configuration on RTA. The configuration is as follows:
Interface information of VPN-Instance: public net
GigabitEthernet0/0/1 (192.168.1.1):
IGMP is enabled
Current IGMP version is 2
IGMP state: up
IGMP group policy: none
IGMP limit: -
Value of query interval for IGMP (negotiated): -
Value of query interval for IGMP (configured): 60 s
Value of other querier timeout for IGMP: 0 s
Value of maximum query response time for IGMP: 10 s
Querier for IGMP: 192.168.1.1 (this router)
Given this, which of the following statements is false?

Question97: On the campus OSPF network shown in the following figure, the interfaces connecting the five routers are GE interfaces, and their costs are not changed. The import-route command is run on R1. After the network converges, the route to the server at 192.168.1.0/24 is queried on R2. Which of the following is the cost of this route?

Question98: When creating a single-hop BFD session for the first time, bind the single-hop BFD session to the peer IP address and the local address. To modify a configured BFD session, delete it and create a new one.

Question99: The Neighbor Discovery Protocol (NDP) is an important basic protocol in the IPv6 protocol suite and plays an important role. Which of the following functions and features does it support?

Question100: GRE is a VPN encapsulation technology that is widely used to transmit packets across heterogeneous networks. Which of the following statements is false about GRE?

Question101: Which of the following routing protocols support the default route through command configuration?

Question102: A campus network uses OSPF for network communication. The display ospf peer command is run on a router, and the command output is as follows:
vbnet
Copy
Edit
<R2> display ospf peer
OSPF Process 1 with Router ID 10.0.2.2
Area 0.0.0.0 interface 10.0.235.2 (GigabitEthernet0/0/1)'s neighbors
Router ID: 10.0.5.5 Address: 10.0.235.5
State: Full Mode: Nbr is Master Priority: 1
DR: 10.0.235.5 BDR: 10.0.235.3 MTU: 0
Dead timer due in 40 sec
Area 0.0.0.0 interface 10.0.24.2 (Serial1/0/1)'s neighbors
Router ID: 10.0.4.4 Address: 10.0.24.4
State: Full Mode: Nbr is Master Priority: 1
DR: None BDR: None MTU: 0
Dead timer due in 35 sec
Which of the following statements are true about the device?

Question103: Which of the following statements is false, based on the following IGMP information on an interface of RTA?
XC

Question104: An IP prefix list is a common matching tool used in routing policies. Which of the following cannot be configured as matching conditions in an IP prefix list on a Huawei router?

Question105: Which of the following statements regarding BGP route advertisement are false?

Question106: According to BGP route selection rules, the route with the higher Local_Pref is preferred.

Question107: After the administrator of an enterprise deploys a DHCP server, employees complain that their clients cannot obtain IP addresses from the DHCP server. Which of the following may cause this problem?

Question108: A router performs a lookup in its FIB table for a packet. If the tunnel ID in the matching entry is 0, the packet needs to be forwarded through a tunnel, such as an MPLS tunnel.

Question109: Which of the following statements regarding the summary automatic command and BGP route summarization is false?

Question110: When an SSH client accesses an SSH server for the first time and the SSH server's public key is not configured on the SSH client, you can enable first-time authentication on the SSH client. This allows the SSH client to access the SSH server and saves the SSH server's public key on the SSH client. In this way, the next time the SSH client accesses the SSH server, the SSH client can use the saved public key to authenticate the SSH server.

Question111: Which of the following statements about WLAN roaming are true?

Question112: Which of the following statements regarding DR/BDR are false?

Question113: To enable PC1 to access PC2 using the IP address of the firewall's GE0/0/2, you need to configure NAPT for source address translation. In the following figure, fill in the blank to complete the command.

Question114: On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routing tables contain the routes to 192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?

Question115: Compared with OSPF, IS-IS has higher scalability because IS-IS uses the______structure to construct packets. (Enter the acronym in uppercase.)

Question116: Roaming technology is typically used on a large WLAN to ensure that STA (station) services are not interrupted when STAs move between coverage areas of different APs.

Question117: After HSB is configured, the HSB channel fails to be established and cannot back up information on the active device to the standby device. What are the possible causes for this HSB function failure?

Question118: When a router running BGP is in the Connect state, BGP starts the ConnectRetry timer and waits for a TCP connection to be established. If BGP does not receive any response from a BGP peer throughout the ConnectRetry timer, BGP attempts to establish TCP connections with other BGP peers and remains in the Connect state.

Question119: STAs stay on different subnets before and after Layer 3 roaming. To enable the STAs to access the original network after roaming, network engineers need to configure user traffic to be forwarded to the original subnet over a CAPWAP tunnel.

Question120: Which of the following statements regarding Local-Preference in BGP is true?

Question121: By default, a router interface sends PIM Hello messages at an interval of __________ seconds.

Question122: Which of the following attacks is not the network layer attack?

Question123: Which of the following attributes cannot be directly referenced in an apply clause of a route-policy?

Question124: BFD can quickly detect faults in channels at multiple network layers, ensuring high reliability. To which of the following layers does BFD belong?

Question125: Which of the following statements regarding OSPF route summarization is false?

Question126: What is the default sending interval of BFD packets?

Question127: VRRP defines three states. Only the device in which state can forward packets destined for a virtual IP address?
(Write in full and capitalize the first letter.)

Question128: Which of the following attributes must be carried when BGP sends route update messages?

Question129: In IPv6, to communicate with a destination host, a host must obtain the link-layer address of the destination host through ARP.

Question130: A switch running a later IGMP version can identify Report messages of an earlier IGMP version, but the switch running an earlier IGMP version cannot identify Report messages of a later IGMP version. To ensure that IGMP runs properly, you are advised to set the IGMP version on the switch to be the same as or later than the IGMP version of member hosts.

Question131: Route summarization is a mechanism that combines multiple routes. BGP supports automatic summarization and manual summarization on IPv6 networks.

Question132: See the following figure. RTA, RTB, RTC, and RTD are in the same AS and establish IBGP peer relationships through direct links. RTB an RTC are route reflectors (RRs), RTA and RTC are the RR clients of RTB, and RTB and RTD are the RR clients of RTC. If RTA advertises the route 10.1.1.0/24 to the BGP process, the Originator ID of the BGP route received by RTD is------------------.

Question133: OSPF has multiple types of routes with varying priorities. Which of the following types of routes has the lowest priority when they have the same prefix?

Question134: As shown in the figure, R1 imports the direct route 10.1.1.0/24 to OSPF. An engineer enables bidirectional route re-advertisement on R2 and R3.

After the network becomes stable, which of the following is the Pre (preference) value of the route 10.1.1.0
/24 in the routing table of R3?

Question135: When deploying a VRRP network, an enterprise administrator sets the virtual IP address to
192.168.1.254 and VRID to 1. Which of the following is the virtual MAC address after the network becomes stable?

Question136: BGP routes have multiple path attributes. When a router advertises a BGP route to its peers, the route carries multiple path attributes. These attributes describe the characteristics of the BGP route and affect route selection in some scenarios. The attribute is Huawei-specific. It is valid only on the local device and is not transmitted to BGP peers. (Enter the attribute name in lowercase as it appears in the command output about the BGP routing table.)

Question137: BGP is a distance-vector protocol that implements route reachability between ASs and selects optimal routes.
Which of the following statements are true about this protocol?

Question138: Which of the following statements about the forwarding plane of a switch is false?

Question139: BFD provides fast fault detection independent of media and routing protocols. To use this mechanism to detect link connectivity, devices at both ends must support this feature.

Question140: A company has a stack consisting of three switches that are running properly. The master switch restarts due to a fault. Given this, which of the following statements are true?