CSS refers to the combination of two switch devices that support cluster features and logically combine them into one switch device.

• A.TURE
• B.FALSE

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When building a campus network, which of the following protocols can be used to avoid Layer 2 loops?

• A.RSTP
• B.SNMP
• C.OSPF
• D.NAT

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After the link authentication is completed, the STA will continue to initiate link service negotiation. Which of the following messages is used to achieve the specific negotiation?

• A.Handshake
• B.Negotiate
• C.Join
• D.Association

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By default, what is the STP Forward Delay time in seconds?

• A.5
• B.15
• C.10
• D.20

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As shown in the figure, all four switches run STP, and various parameters adopt default values. If the G0/0/2 port of switch C is blocked and the configuration BPDU cannot be sent through this port, how long will it take for the blocked port in the network to enter the forwarding state?

• A.about 50 seconds
• B.about 30 seconds
• C.about 3 seconds
• D.about 15 seconds

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