2 ccn

101.Which fields in the IPv4 header are related to fragmentation? (Multiple Choice)

• A.TTL

• B.Fragment Offset

• C.Identification

• D.Flags

Answer explanation

✅ B. Fragment Offset

• YES — directly related to fragmentation.

• This field tells the receiver where in the original packet the current fragment belongs.

• Measured in 8-byte blocks (not bytes).

✅ C. Identification

• YES — directly related to fragmentation.

• All fragments of the same packet have the same Identification number.

• This allows the receiver to reassemble fragments correctly.

✅ D. Flags

• YES — directly related to fragmentation.

• Contains 3 bits:

  • DF (Don't Fragment): If set, the packet cannot be fragmented.

  • MF (More Fragments): If set, it indicates that more fragments are coming.

• Helps control and manage fragmentation behavior.

❌ A. TTL (Time To Live)

• NO — not related to fragmentation.

• TTL is used to prevent packets from looping forever in the network.

• It counts down each time a router handles the packet, and drops it when it reaches zero.

102.As shown in the figure below, which of the following statements are correct?

• A. Host A can ping host B

• B. Host A and Host B cannot obtain each other's MAC address

• C. The following entry 10.0.12.5 MAC-B exists in the ARP cache of host A

• D. The broadcast address of host A and host B are the same

103. As the figure shown: (Multiple Choice)

• A. Client3 belongs to VLAN30, and the command for dividing VLAN on the switch is correct

• B. Client4 belongs to VLAN40, and the command for dividing VLAN on the switch is correct

• C. Client2 belongs to VLAN20, and the switch based on the MAC address division command is correct

• D. Client1 belongs to VLAN10, and the command for dividing VLAN on the switch is correct

104.The load sharing mode at both ends of the Eth-Trunk can be inconsistent.

• A.TRUE

• B.FALSE

Answer explanation

105. When Huawei switches allow STP, the priority of the switch is by default:

• A.32768

• B.8192

• C.16384

• D.4096

106.As shown in the figure, the switch runs STP with default parameters, which of the following ports will

be elected as the designated port?

• A. G0/0/1 port of switch A

• B. Port G0/0/2 of switch A

• C. HUB's G0/0/1 port

• D. HUB's G0/0/2 port

Answer explanation

🖼️ Given Scenario (based on description):

• There is a switch (SWA) connected to a HUB.

• Ports involved:

  • G0/0/1 on SWA

  • G0/0/2 on SWA

  • HUB has two ports: G0/0/1 and G0/0/2 (but hubs are layer 1 devices and don’t participate in STP).

• Since the hub is passive, the switches decide who will be the designated port for the shared segment.

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🔍 Why Option A is Correct:

• STP only runs on switches, not hubs.

• The Designated Port is the switch port that is closest to the root on a segment.

• Assuming both G0/0/1 and G0/0/2 are connected to the same collision domain (via the hub), and both belong to Switch A, the lower-numbered port (G0/0/1) is preferred.

107.What is the Solicited-node multicast address corresponding to IPv6 address 2019 :: 8:AB?

• A.FF02 :: 1 :: FF08: AB

• B.FF02 :: FF08: AB

• C.FF02 :: 1 :: FF20: 19

• D.FF02 :: 1 :: FE08: AB

Answer explanation

How to Build a Solicited-Node Address

• The prefix FF02::1:FF is fixed.

• The last 24 bits of the unicast or anycast IPv6 address are added to it.

🔍 Option Analysis:

• A. FF02::1:FF08:AB → ✅ Correct

• B. FF02::FF08:AB → ❌ Missing the ::1: part of the structure.

• C. FF02::1:FF20:19 → ❌ Uses incorrect bits from the address.

• D. FF02::1:FE08:AB → ❌ FE is wrong; it should be FF.

108.For the description of the PPP link establishment process, which of the following statement is wrong?

Answer: B

• A. In the Establish phase, the PPP link performs LCP parameter negotiation. The negotiation content

  includes the maximum receiving unit MRU, authentication method, magic word and other options.

• B. After the NCP negotiation is successful, the PPP link will maintain the communication state and enter

  the Terminate phase.

• C. The Dead phase is also called the physical layer unavailable phase. When the two ends of the

  communication detect that the physical line is activated, they will migrate from the Dead phase to the

  Establish phase, which is the link establishment phase.

• D. In the Network phase, the PPP link performs NCP negotiation. Select and configure a network layer

  protocol through NCP negotiation, and negotiate network layer parameters

• E. PPP link supports half-duplex and full-duplex modes

109.Which statement about SNMP protocol is correct?

• A. SNMP uses UDP as the transport layer protocol

• B. SNMP uses ICMP as the network layer protocol

• C. SNMP protocol uses multicast to send management messages

• D. The SNMP protocol only supports the sending of flash management messages on the Ethernet link

110. Which of the following commands can be used to view the router's CPU usage?

• A.display cpu-state

• B.display interface

• C.display memory

• D.display cpu-usage