Regarding the DSCP field, the following statement is incorrect: single selection

• A.When the value of DSCP is EF, it indicates that the data belongs to the accelerated forwarding class.
• B.The DSCP value can be 0, and packets use the default forwarding mechanism when 0
• C.In addition to indicating the priority of the data, DSCP can also indicate the probability of data being discarded. The CS class in DSCP divides data into 8 priorities.

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Which of the following statements about 802.1X authentication are correct?

• A.802.1X authentication uses EAPoL to exchange authentication information between the client, device, and authentication server.
• B.In EAP termination mode, EAP packets are terminated and re-encapsulated into RADIUS packets on the network access device. The network access device and AAA server use the standard RADIUS protocol to implement authentication, authorization, and accounting.
• C.EAPoL implements EAP encapsulation on an IEEE 802.3 network, whereas EAPoW implements EAP encapsulation on an IEEE 802.11 network.
• D.In EAP relay mode, EAP packets are directly encapsulated by the network access device into RADIUS packets (that is, EAP over RADIUS, or EAPoR). The network access device and AAA server use EAPoR to perform authentication, authorization, and accounting.

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As shown in the figure, R1, R2, R3, and R4 reside in the same MPLS domain, and LDP (Label Distribution Protocol) is used to distribute MPLS labels.
R4 is the egress LSR (Label Switching Router) for the FEC (Forwarding Equivalence Class) 4.4.4.0/24.
To make R4 aware of QoS forwarding priority of a packet sent from R1 and destined for 4.4.4.0/24, Without looking up R4's label forwarding information base, The outgoing label of the FEC on R3 should be _____ (Enter an Arabic numeral without symbols).

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On an SR-MPLS network, manually configured prefix SIDs on different devices may conflict with each other. Assume that there are four routes (prefix/mask SID) as follows. Which of the following routes will be selected according to the conflict handling principle?

• A.1.1.1.1/32 → SID 2
• B.1.1.1.1/32 → SID 1
• C.2.2.2.2/32 → SID 3
• D.3.3.3.3/32 → SID 1

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IPsec uses an asymmetric encryption algorithm to encrypt the symmetric algorithm key, which it uses to encrypt/decrypt data, ensuring security and performance.

• A.TRUE
• B.FALSE

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