Refer to the exhibit. Which outcome is expected when PC_A sends data to PC_B after their initial communication?
Refer to the exhibit. Which outcome is expected when PC_A sends data to PC_B after their initial communication?
When PC_A sends data to PC_B after their initial communication, the source and destination MAC addresses remain the same. This is because within the same VLAN, the switch forwards frames based on MAC addresses, and it does not alter the original source and destination MAC addresses in the Ethernet frame. The initial communication refers to the ARP process where MAC addresses are discovered. After this initial step, subsequent communications use the same MAC addresses.
key work is after their initial communication
good point noted
You have a TCP/IP network. This means that PC A and PC B have an IP address each. PC A knows PC B's address and creates an IP packet for PC B. Then, the packet (Layer 3) becomes an Ethernet frame (Layer 2): PC A gets PC B's MAC address and uses it as the destination L2 address. When the frame arrives at SW1, the switch looks at the destination MAC address and controls (in its MAC table) to which port that address is associated. Then, the switch sends the frame to PC B through that port (forwarding phase). The switch leaves unchanged BOTH the source and the destination MAC addresses inside the frame. Answer C is correct.
after their initial communication -> before answer is B after answer is C C correct
Thank you for sharing, brief and to the point. Good to know that someone is sharing what I was thinking.
Language aims to trick rather than test knowledge imo.
Yes, it's mostly gotcha questions aimed at confusing people.
By "after intial communication", 'intial comm.' here refers to the initial ARP (Address Resolution Protocol) connection. ARP Request message is sent by PC A by sending a frame (layer 2 datagram) to PC B via the switch. Since PC A does not know the MAC address of PC B, but only the latter's ip address; the Switch receives the frame (source MAC address known, destination MAC address unknown) from PC A and in turn floods out a broadcast message to all its remaining ports on the same VLAN as the received frame. ....
The switch never alters the source and destination MAC addresses within the frame. C is the correct choice.
C is correct