On the MSR router, the -tos parameter of the ping command specifies the value of the ToS (Type of Service) field in the ICMP Echo Request message, the value range is 0~255, and the default value is ______.

• A.2
• B.46
• C.63
• D.0

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After executing the display vlan 2 command on the switch SWA, the switch output is as follows:
<SWA> display vlan 2
VLAN ID: 2
VLAN Type: static
Route interface: not configured
Description: VLAN 0002
Tagged Ports: none
Untagged Ports:
Ethernet1/0/1 Ethernet1/0/3 Ethernet1/0/4
It can be judged from the above output ______. (Multiple choice)

• A.VLAN2 contains ports Ethernet1/0/1, Ethernet1/0/3 and Ethernet1/0/4
• B.The current VLAN on the switch is only VLAN2 and Vlan1 must exist
• C.Port Ethernet1/0/1 is a Trunk port hybrid
• D.Data frames with VLAN2 tags need to be stripped off when they leave port Ethernet1/0/3

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According to the definition of the OSI seven-layer reference model, _____ is responsible for providing flow control, checking the correctness of data transmission, and providing support for multiple upper-layer protocols. (Multiple choice)

• A.Application layer
• B.Transport layer
• C.Data link layer
• D.Network interface layer
• E.Presentation layer
• F.Network layer
• G.Session layer
• H.Physical layer

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In the network environment as shown in the figure, perform the following NAT configuration on RTA:

[RTA]acl number 2000
[RTA-acl-basic-2000]rule 0 permit source 100.0.0.0 0.0.0.255
[RTA-acl-basic-2000]nat address-group 1 200.76.28.11 200.76.28.11
[RTA]interface Ethernet0/1
[RTA-Ethernet0/1]nat outbound 2000 address-group 1
After configuration, both Client_A and Client_B are accessing Server, then the NAT table of RTA may be ______ at this time.

• A.Protocol GlobalAddr Port InsideAddr Port DestAddr Port 1 200.76.28.12 12289 100.0.0.1 1024 200.76.29.4 1024 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:59 1 200.76. 28.11 12288 100.0.0.2 512 200.76.29.4 512 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:51
• B.Protocol GlobalAddr Port InsideAddr Port DestAddr Port 1 200.76.28.11 12289 100.0.0.1 1024 200.76.29.4 1024 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:59 1 200.76. 28.11 12288 100.0.0.2 512 200.76.29.4 512 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:51
• C.Protocol GlobalAddr Port InsideAddr Port DestAddr Port 1 200.76.28.11 12289 100.0.0.1 1024 200.76.29.4 1024 VPN: 0, status: NOPAT, TTL: 00:01:00, Left: 00:00:59 1 200.76. 28.11 12288 100.0.0.2 512 200.76.29.4 512 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:51
• D.Protocol GlobalAddr Port InsideAddr Port DestAddr Port 1 200.76.28.11 12289 100.0.0.1 1024 200.76.29.4 1024 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:59 1 200.76. 28.12 12288 100.0.0.2 512 200.76.29.4 512 VPN: 0, status: 11, TTL: 00:01:00, Left: 00:00:51

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The MAC address table on a layer 2 switch is shown in the figure.

When the switch receives a broadcast frame from the E1/0/1 interface, it will ______ the frame. (Multiple choice)

• A.Send out from the E1/0/2 interface
• B.Send out from the E1/0/1 interface
• C.Send out from the E1/0/3 interface
• D.send out from all interfaces on the switch
• E.send out from E1/0/4 interface
• F.Discard directly

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