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

• A.A Huawei switch changes from RSTP to STP. After the STP-enabled switch is removed from the network, the RSTP-enabled switch can be moved back to the RSTP mode.
• B.A Huawei switch changes its mode from STP to RSTP. After the RSTP-enabled switch is removed from the network, the STP-enabled switch can be moved back to the RSTP mode.
• C.STP and RSTP are compatible with each other, but the rapid convergence of RSTP is unavailable.
• D.STP and RSTP calculation are performed independently.

Comment: *

Name: *

Email: *

Verification: *

Which of the following statements regarding multicast MAC addresses are false?

• A.One multicast MAC address maps to 32 multicast IP addresses.
• B.One multicast MAC address maps to only one multicast IP address.
• C.The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.
• D.A multicast MAC address identifies receivers of a multicast group on the data link layer.

Comment: *

Name: *

Email: *

Verification: *

See the command output of a router below. Which of the following statements is true?
<R2>display ospf interface GigabitEthernet 0/0/0 verbose
OSPF Process 1 with Router ID 10.0.2.2
Interface: 10.0.12.2 (GigabitEthernet 0/0/0)
Cost: 1 State: BDR Type: Broadcast MTU: 1500
Priority: 1
Designated Router: 10.0.12.1
Backup Designated Router: 10.0.12.2
Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1

• A.The router ID is 10.0.12.2.
• B.The interface cost is 1500.
• C.This router is a BDR.
• D.The interface IP address is 10.1.12.1.

Comment: *

Name: *

Email: *

Verification: *

As shown in the figure, RED calls ip as-path-filter 1 in the inbound direction, then the route
10.0.0/24 will be learned by RE_D from the path ().

Comment: *

Name: *

Email: *

Verification: *

Which of the following descriptions of LSP in IS-IS is incorrect?

• A.There are two types of LSP, namely Level1-1 and Level1-2.
• B.The function of LSP is to exchange link status information
• C.After setting OL, the LSP will not be flooded in the network.
• D.LSP ID consists of three parts, System ID, pseudo node ID and LSP fragmentation number.

Comment: *

Name: *

Email: *

Verification: *