What kind of message does the OSPF protocol use to confirm the received LSU message?

• A.LSR
• B.LSU
• C.LSACK
• D.LSA

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How many types of OSPF messages are there?

• A.4
• B.5
• C.2
• D.3

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Which layer of the OSI reference model does the router work at?

• A.Transport layer
• B.Network layer
• C.Application layer
• D.Data link layer

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The switch GO/0/1 port configuration information is shown in the figure. Which VLAN data frame does the switch forward without VLAN TAG?
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interface GigabitEtherneto/o/1
port link-type trunk
port trunk pvid vlan 10
port trunk allow-pass vlan 10 20 304o
#

• A.10
• B.40
• C.30
• D.20

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The following two configuration commands can realize the router RTA to the same destination 10.1.1.0 routing master and backup backup.
【 RTA 】 ip route-static 10.1.1.0 24 12.1.1.1 permanent
【 RTA 】 ip route-static 10.2.2.0 24 13.1.1.1.

• A.False
• B.True

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