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

In demand mode, once a BFD session is set up, the system no longer periodically sends BFD Control packets.

In asynchronous mode, two systems periodically exchange BFD Control packets at the negotiated interval. If one system does not receive any BFD Control packets from the other within the detection time, the BFD session is declared down.

Asynchronous mode is the primary BFD operating mode.

In demand mode, once a BFD session is set up, the system no longer periodically sends BFD Control packets.

Asynchronous mode does not support the Echo function.

In asynchronous mode, two systems periodically exchange BFD Control packets at the negotiated interval. If one system does not receive any BFD Control packets from the other within the detection time, the BFD session is declared down.

Asynchronous mode is the primary BFD operating mode.

Which command is used to configure the VRRP preemption delay?

vrrp vrid 1 preempt-mode timer delay 20

On the network shown in the following figure, the management VLAN is VLAN 10, and the AP is configured to obtain an IP address on the network segment 10.1.1.0/24 through DHCP. The AP, AC, and AR function as the DHCP client, DHCP relay agent, and DHCP server, respectively. Which of the following configurations for the DHCP relay agent and DHCP server are correct?

[AC] dhcp server group AP [AC-dhcp-server-group-AP] dhcp-server 172.21.1.2 [AC-dhcp-server-group-AP] quit [AC] interface Vlanif 10 [AC-Vlanif 10] dhcp select relay [AC-Vlanif 10] dhcp relay server-select AP [AC-Vlanif 10] quit

[AR] ip pool AP [AR-ip-pool-AP] network 10.1.1.0 mask 24 [AR-ip-pool-AP] gateway-list 10.1.1.2 [AR-ip-pool-AP] excluded-ip-address 10.1.1.1 [AR-ip-pool-AP] quit [AR] interface GigabitEthernet 0/0/1 [AR-GigabitEthernetO/O/1] dhcp select global [AR-GigabitEthernet0/0/l] quit [AR] ip route-static 10.1.1.0 255.255.255.0 172.21.1.1

[AC] dhcp server group AP [AC-dhcp-server-group-AP] dhcp-server 172.21.1.2 [AC-dhcp-server-group-AP] quit [AC] interface Vlanif 10 [AC-Vlanif 10] dhcp select relay [AC-Vlanif 10] dhcp relay server-select AP [AC-Vlanif 10] quit

[AR] ip pool AP [AR-ip-pool-AP] network 10.1.1.0 mask 24 [AR-ip-pool-AP] gateway-list 10.1.1.2 [AR-ip-pool-AP] excluded-ip-address 10.1.1.1 [AR-ip-pool-AP] quit [AR] interface GigabitEthernet 0/0/1 [AR-GigabitEthernetO/O/1] dhcp select global [AR-GigabitEthernet0/0/l] quit [AR] ip route-static 10.1.1.0 255.255.255.0 172.21.1.1

[AR] ip pool AP [AR-ip-pool-AP] network 172.21.1.0 mask 24 [AR-ip-pool-AP] gateway-list 172.21.1.2 [AR-ip-pool-AP] excluded-ip-address 172.21.1.1 [AR-ip-pool-AP] quit [AR] interface GigabitEthernet 0/0/1 [AR-GigabitEthernetO/0/1] dhcp select global [AR-GigabitEthernetO/0/1] quit [AR] ip route-static 10.1.1.0 255.255.255.0 172.21.1.1

[AC] dhcp server group AP [AC-dhcp-server-group-AP] dhcp-server 10.1.1.2 [AC-dhcp-server-group-AP] quit [AC] interface Vlanif 10 [AC-Vlanif 10] dhcp select relay [AC-Vlanif 10] dhcp relay server-select AP [AC-VlaniflO] quit

As shown in the figure, data traffic is forwarded in tunnel mode along the path of STA -> HAP -> HAC -> upper-layer network before roaming. What is the flow direction of data traffic after Layer 3 roaming?

STA -> FAP -> FAC -> HAC -> Upper-layer network

STA -> FAP -> FAC -> HAC -> HAP -> HAC -> Upper-layer network

STA -> FAP -> FAC -> HAC -> Upper-layer network

STA -> FAP -> FAC -> Upper-layer network

STA -> FAP -> FAC -> HAC -> HAP -> Upper-layer network

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?

The TCP channel is not established.

The retransmission count and interval for HSB service packets are different on the two devices.

The source IP address and port number of the local end are different from the destination IP address and port number of the remote end.

The TCP channel is not established.

The retransmission count and interval for HSB service packets are different on the two devices.

The two ACs have the same priority.

The source IP address and port number of the local end are different from the destination IP address and port number of the remote end.

Which of the following statements about WLAN roaming are false?

During roaming, the STA sends an Association Request frame containing home AP information to the foreign AP.

APs with which a STA is associated before and after roaming must work on the same channel.

APs with which a STA is associated before and after roaming can work on different channels.

During roaming, the STA sends a Reassociation Request frame containing home AP information to the foreign AP.

During roaming, the STA sends an Association Request frame containing home AP information to the foreign AP.

APs with which a STA is associated before and after roaming must work on the same channel.

During routine maintenance, an enterprise administrator runs a command to check VRRP group information. Which of the following statements is false about the command output?yamlCopyEdit<HUAWEI> display vrrp verboseVlanif100 | Virtual Router 1 State: MasterVirtual IP: 10.1.1.100Master IP: 10.1.1.2PriorityRun: 120 PriorityConfig: 120DR: None BDR: None MTU: 0Preempt: YES Delay Time: 20sRemain: --Track: YES Priority Reduced: 20Auth Type: MD5BFD-session State: UP

This VRRP group is an mVRRP group.

Preemption is enabled for the VRRP group.

This VRRP group is an mVRRP group.

Authentication is enabled for the VRRP group.

On a network, each router has a local core routing table and protocol routing tables. A routing entry in the local core routing table has multiple key fields. Which of the following are included?

Routing protocol preference of a route

Routing protocol that learns a route

Routing protocol preference of a route

Inbound interface that learns a route

Routing protocol that learns a route

On an office network of an enterprise, OSPF is enabled on two directly connected routers. During adjacency establishment, the state machine stays in the 2-way state. Which of the following statements are not possible causes?

The N-bit and E-bit of Hello packets are the same.

Hello time values are different.

The N-bit and E-bit of Hello packets are the same.

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:vbnetCopyEdit<R2> display ospf peerOSPF Process 1 with Router ID 10.0.2.2Area 0.0.0.0 interface 10.0.235.2 (GigabitEthernet0/0/1)'s neighborsRouter ID: 10.0.5.5 Address: 10.0.235.5State: Full Mode: Nbr is Master Priority: 1DR: 10.0.235.5 BDR: 10.0.235.3 MTU: 0Dead timer due in 40 secArea 0.0.0.0 interface 10.0.24.2 (Serial1/0/1)'s neighborsRouter ID: 10.0.4.4 Address: 10.0.24.4State: Full Mode: Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 35 secWhich of the following statements are true about the device?

The IP address of the DR on the network where R2 and its neighbor 10.0.5.5 reside is 10.0.235.5.

R2 has established adjacencies with 10.0.5.5 and 10.0.4.4.

Router IDs of the two OSPF neighbors of R2 are 10.0.5.5 and 10.0.4.4.

The IP address of the DR on the network where R2 and its neighbor 10.0.5.5 reside is 10.0.235.5.

R2 has established adjacencies with 10.0.5.5 and 10.0.4.4.

The DR/BDR election fails on the network where R2 and its neighbor 10.0.4.4 reside.

Router IDs of the two OSPF neighbors of R2 are 10.0.5.5 and 10.0.4.4.

An enterprise administrator views the following details about a BGP route during routine O&M:yamlCopyEdit<HUAWEI> display bgp routing-table 192.168.1.1BGP local router ID: 10.1.1.1Local AS number: 100Paths: 2 available, 0 best, 0 selectBGP routing table entry information of 192.168.1.1/32:From: 10.1.1.2 (10.1.1.2)Route Duration: 00h01m31sRelay IP Nexthop: 0.0.0.0Relay IP Out-Interface: --Original nexthop: 172.16.1.2AS-path: 200, origin incomplete, MED 0, localpref 100, pref-val 0, internal, pre 255, invalid for IP unreachableNot advertised to any peer yetWhich of the following statements are true about the BGP route?

The original next hop of the route is 172.16.1.2.

The local BGP router ID is 10.1.1.1.

The original next hop of the route is 172.16.1.2.

The local BGP router ID is 10.1.1.1.

The route is preferentially selected because its Local_Pref has a higher priority.

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?

The DHCP function is disabled by default, and the administrator forgets to enable the DHCP function.

DHCP clients and the DHCP server are on different network segments, and no DHCP relay agent is configured on the network.

Multiple DHCP servers are configured.

STP is enabled on the DHCP server.

The DHCP function is disabled by default, and the administrator forgets to enable the DHCP function.

DHCP clients and the DHCP server are on different network segments, and no DHCP relay agent is configured on the network.

On an enterprise WLAN where Portal authentication is deployed, an AC functions as an access device and communicates with a Portal server using the Portal protocol. Which of the following statements are true about the Portal protocol?

The HTTP or HTTPS protocol can be used as the Portal access or authentication protocol.

Portal protocol packets are transmitted over TCP.

The HTTP or HTTPS protocol can be used as the Portal access or authentication protocol.

By default, the access device processes Portal protocol packets through port 2000.

By default, the device uses the destination port number 50100 to proactively send packets to the Portal server.

Portal protocol packets are transmitted over TCP.

Huawei H12-821_V1.0 Practice Test 5 - Free Online Exam Prep & Questions

As shown in the figure, the stateful inspection firewall forwards the packet because the packet matches the session status of the firewall.

Huawei H12-821_V1.0 image Question 161 131430 12022024235652000000

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