H12-811_V1.0 Practice Questions

Detailed Explanation:

• Option A: Incorrect. UDP (User Datagram Protocol) does not use SYN or ACK flags, as it is a connectionless protocol and does not establish a connection before data transfer. SYN and ACK flags are features of TCP (Transmission Control Protocol), which establishes connections using a three-way handshake. (Reference: HCIA-Datacom Training Material, Transport Layer Protocols)

• Option B: Incorrect. UDP is suitable for delay-sensitive traffic (such as video or voice) because of its low overhead. However, UDP does not have a sequence number field or support reassembly, as it does not guarantee packet order or reliability. (Reference: HCIA-Datacom Training Material, UDP Characteristics)

• Option C: Correct. TCP requires a three-way handshake to establish a connection and a four-way handshake to terminate it, involving SYN, ACK, FIN flags for reliability. (Reference: HCIA-Datacom Training Material, TCP Connection Establishment and Termination)

• Option D: Correct. The well-known port number range is defined as 0 to 1023, and these are reserved for widely used protocols such as HTTP, FTP, and DNS. (Reference: HCIA-Datacom Training Material, Port Numbering)

Encapsulation is the process of adding headers and trailers to data at each layer of the OSI model as the data moves from the application layer to the physical layer. Decapsulation is the reverse process when data is received. These processes are critical in implementing network communication, ensuring the proper function of protocols, and assisting in locating faults during data transmission. They do not, however, shorten packet length​

A "Length/Type" field value of 0x0806 indicates an ARP (Address Resolution Protocol) frame, which is part of the Ethernet II frame standard. The source MAC address cannot be a broadcast address (FFFF-FFFF-FFFF), as ARP requests are sent from specific hosts. This field helps identify the protocol type used by the Ethernet frame​.

Detailed Explanation:APs can be added to an AC using multiple methods. You can add them when they are online, offline, or allow the AC to automatically discover them. Additionally, unauthorized APs can be manually confirmed for security​.