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質問 # 80
Which of the following is correct regarding the configuration of the trunk port and access port on a switch?
正解：A
解説：
Access ports are configured for a single VLAN and thus send untagged frames by default. Trunk ports, conversely, handle traffic for multiple VLANs, tagging each frame with a VLAN ID.
質問 # 81
In the figure, a web client sends an HTTP request to a web server, and the router in between performs operations on the HTTP request. Which of the following statements are false about the router's operations?
(Select all that apply)
正解：A、B、D
解説：
A router works mainly at the network layer . When it receives a frame, it removes the Layer 2 header and trailer, examines the destination IP address in the Layer 3 header, consults the routing table, selects the outgoing interface, and then re-encapsulates the packet into a new Layer 2 frame for the next hop. Therefore, statement B is true and is not part of the answer.
Statement A is false because the router does not create a new destination IP address during normal forwarding. The source and destination IP addresses remain unchanged end to end unless special functions such as NAT are used. Statement C is false because routing-table lookup is based on the destination IP address, not on TCP or UDP port numbers. Statement D is also false because normal IP routing does not inspect application-layer content to determine the outgoing interface. That decision is made from the network- layer destination address and the routing table. This question tests the layered forwarding logic of routers in TCP/IP networks.
質問 # 82
The administrator performs the configuration shown in the figure on SW1 and SW2. Initially, PC1 is connected to GE1/0/1 of SW1. After the network is stable, the administrator pings the IP addresses of PC2 and PC3 from PC1. Later, the administrator connects PC1 to GE1/0/2 of SW1. After the network is stable, the administrator pings the IP addresses of PC2 and PC3 from PC1. Which of the following statements is false about this scenario?
正解：D
解説：
The exhibit assigns SW1 GE1/0/1 to VLAN 10 and GE1/0/2 to VLAN 20, while the trunk between SW1 and SW2 carries the required VLANs. When PC1 is connected to GE1/0/1, its untagged frames are classified into VLAN 10. PC2 is also in VLAN 10, so PC1 can communicate with PC2 at Layer 2, whereas PC3 is in VLAN
20 and is separated by the VLAN boundary. SW1 learns PC1 ' s source MAC address together with VLAN 10 and ingress interface GE1/0/1. When PC1 is moved to GE1/0/2, its untagged frames are now placed in VLAN
20. After MAC relearning occurs, PC1 can communicate with PC3, which is also in VLAN 20, but not directly with PC2 in VLAN 10 unless Layer 3 inter-VLAN routing is provided. Consequently, statement A is false because PC1 is not isolated from both hosts after the move; it can communicate with PC3.
質問 # 83
On the network shown in the figure, GE1/0/1, GE1/0/2, and GE1/0/3 of SW1 are directly connected to SW2, and GE1/0/4 of SW1 is directly connected to SW3. The administrator runs the interface eth-trunk 1 command on SW1 and SW2 to create an Eth-Trunk to increase link bandwidth. Which of the following statements are true about this scenario?
正解：A、C、D
解説：
LACP mode and manual load-balancing mode behave differently when an Eth-Trunk contains a link connected to the wrong peer. In LACP mode, member interfaces exchange LACPDUs and the switches determine which physical links can participate in the same aggregation. GE1/0/1 through GE1/0/3 are correctly connected between SW1 and SW2, so they can form an operational LACP Eth-Trunk. GE1/0/4 is connected to SW3 and cannot successfully negotiate as a member of the SW1-SW2 LAG; it is therefore not used for service forwarding to SW3. This makes A and B true. In manual mode, there is no LACP negotiation to validate that every member terminates on the same peer. If GE1/0/4 is manually placed in the trunk, the device may treat it as a forwarding member and hash some traffic onto that link toward SW3. The trunk does not automatically go Down solely because of that incorrect peer connection. Therefore C is false and D is true.
質問 # 84
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds. Employee A uses PC1 to connect to the GE1/0/1 port of the switch and continuously communicates with PC3 for 10 minutes. After that, the employee disconnects the network cable and leaves the workstation.
Subsequently, PC4 continues to communicate with PC3. After 30 minutes, employee B connects PC2 to GE1/0/1 of SW1, and PC2's ARP cache table is empty. At this point, when SW1 receives an ARP request from PC2, it will search the MAC address table and forward the request packet only through GE1/0/3.
正解：A
解説：
An ARP request is a broadcast frame, so a switch does not use MAC address table lookup to forward it to a single port. Instead, it floods the frame to all other ports within the same VLAN except the incoming interface. Therefore, SW1 will not forward the ARP request only through GE1/0/3, making the statement incorrect.
質問 # 85
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