Networking Models and Protocols Flashcards

Which OSI layer is responsible for establishing, maintaining, and terminating communication sessions between applications?

Answer: Session layer

The Session layer (Layer 5) manages dialog control and synchronization between communicating systems.

In the TCP/IP model, which layer corresponds most closely to both the OSI Session and Presentation layers?

Answer: Application layer

The TCP/IP Application layer combines the functions of the OSI Application, Presentation, and Session layers.

What is the primary purpose of the Presentation layer in the OSI model?

Answer: Data encryption, compression, and format translation

The Presentation layer (Layer 6) handles data formatting, encryption, and compression so the Application layer can interpret the data.

Which protocol operates at the OSI Network layer and is responsible for logical addressing and routing?

Answer: IP

IP (Internet Protocol) operates at Layer 3 and handles logical (IP) addressing and routing of packets.

A network technician needs to capture and analyze packets on a network segment. Which OSI layer do packet sniffers primarily operate at?

Answer: Layer 2 – Data Link

Packet sniffers capture frames at the Data Link layer (Layer 2), though they can decode information from all encapsulated layers.

Which of the following best describes the concept of 'encapsulation' in networking?

Answer: Adding headers and trailers as data moves down the OSI layers

Encapsulation is the process of adding protocol-specific headers (and sometimes trailers) at each OSI layer as data moves from sender to receiver.

UDP differs from TCP primarily because UDP:

Answer: Is connectionless and does not guarantee delivery

UDP is a connectionless Transport layer protocol that sends datagrams without establishing a connection or guaranteeing delivery.