Layered Network Models

The following are communication network components and devices:

• routers

• switches

• protocols

• applications

The OSI Reference Model (RM) has _____layers.

• seven

• six

• five

• four

The _____ layer is responsible for web services.

• application

• presentation

• network

• session

Which layers are regarded as peer-to-peer communication?

• application

• presentation

• session

• network

A PDU format at the network layer is called a

• packet

• segment

• frame

• bit

_____ is a process by which a lower-layer protocol receives data from a higher-layer protocol and then places the data into the data portion of its frame.

• encapsulation

• fragmentation

• segmentation

• decapsulation

For layered network models, the TCP/IP Protocol Suite maintains the _____ layers.

• network

• transport

• application

• network access

For the TCP/IP Protocol Suite, which layers are merged from the OSI RM?

• application

• network access

• internet

• transport

A data link layer consists of a _____ and a _____.

• header

• trailer

• datagram

• segment

End-to-end data transmission occurs at _____.

• application

• transport

• internet

• network access