Which of the following protocols operate at the application layer? (Choose all that apply.)
Answer(s): A,B,C,D,E
The transport layer receives data from the application layer, encapsulates the corresponding header, and helps nodes establish end-to-end connections. Typical transport layer protocols include TCP and UDP.
Answer(s): A
On a data communication network, the network layer header of a packet sent by the source node carries the network layer addresses of both the source and destination nodes of the packet. Network devices with the routing function maintain the routing table. When receiving the packet, which address carried in the network layer do these network devices read and search their routing tables for a matching entry? After one is found, the packet is forwarded accordingly.
Answer(s): C
A device that works at the data link layer, such as an ethernet switch. Which table does the ethernet switch maintain to guide data frame forwarding?
An IPv4 address is 64 bits long, and an IPv6 address is 128 bits long.
Answer(s): B
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