about data communications part A

1. Data communications

2. • 1) _____ : the information to be communicated in a data communication system
• a- Medium b- Protocol
• c- Modem d- Messages
• 2) Network performance is affected by:
• a- Transmission medium type b- Number of users
• c- Software efficiency d- All of the previous
• 3) The _____ model describes seven layers that computer systems use to
communicate over a network communication media.
• a- TCP b- Protocols
• c- Open Systems Interconnection d- All of the previous

3. • 4) In which layer of the Internet model would the HTTP standard be used?
• a- Transport b- Session
• c- Application d- Browser
• 5) A(n) ____is a set of rules that determine what a layer would do and
provides a clearly defined set of messages that software at the layer needs to
understand.
• a- Software b- Layers
• c- Protocol d- Wan
• 6) A group of personal computers or terminals located in the same general
area and connected by a common cable is called:
• a- Model b- Layers
• c- LAN d- Wan

4. • 7) The term ________ means communication at a distance.
• a- Wireless b- communications
• c- Telecommunication d- Data
• 8) A group of computers that are exchanging data is called :
• a- Wan b- Nodes
• c- Network d- Messages
• 9) Which of the following is not an application layer protocol?
• a- HTTP b- T1
• c- IMAP d- SMTP