midterm

Question 1

How many layers OSI Model have?

Answer 1

7 Layers

Question 2

Specified in ISO _____

Answer 2

7498

Question 3

Relates to Communication Technology

Answer 3

Layers 1 to 4

Question 4

Relates to User Application

Answer 4

Layers 5-7

Question 5

Represents services that directly support software applications for file transfers, database access, and electronic mail etc.

Answer 5

Application Layer 7

Question 6

Related to representation of transmitted data
–Translates different data representations from the Application layer into uniform standard format
•Providing services for secure efficient data transmission
–e.g. data encryption, and data compression.

Answer 6

Presentation Layer 6

Question 7

Allows two applications on different computers to establish, use, and end a session.
–e.g. file transfer, remote login
•Establishes dialog control
–Regulates which side transmits, plus when and how long it transmits.
•Performs token management and synchronization.

Answer 7

Session Layer 5

Question 8

Manages transmission packets
–Repackages long messages when necessary into small packets for transmission
–Reassembles packets in correct order to get the original message.
•Handles error recognition and recovery.

Answer 8

Transport Layer 4

Question 9

Manages addressing/routing of data within the subnet
–Addresses messages and translates logical addresses and names into physical addresses.
–Determines the route from the source to the destination computer
–Manages traffic problems, such as switching, routing, and controlling the congestion of data packets.

Answer 9

Network Layer

Question 10

Packages raw bits from the Physical layer into frames (logical, structured packets for data).
·Provides reliable transmission of frames
·It waits for an acknowledgment from the receiving computer.
·Retransmits frames for which acknowledgement not received

Answer 10

Data Link Layer 2

Question 11

Transmits bits from one computer to another
•Regulates the transmission of a stream of bits over a physical medium.
•Defines how the cable is attached to the network adapter and what transmission technique is used to send data over the cable.

Answer 11

Physical Layer 1

Question 12

_____ devices are products used to connect networks

Answer 12

Internetworking

Question 13

Local Area Network and Devices

Answer 13

1. Bridge
2. Hub
3. Ethernet Switch
4. Router
5. ATM switch

Question 14

Wide Area Networks and Devices

Answer 14

1. Router
2. ATM Switch
3. Modem
4. Comm. Server

Question 15

______ can provide a simple solution if either of these two problems exists.
When signals first leave a transmitting station, they are clean and easily recognizable.

Answer 15

Repeater

Question 16

Multi-port repeaters are often called ______

Answer 16

Hubs

Question 17

Device that serves as the center of a star-topology network, sometimes referred to as a multiport repeater, or in Ethernet, a concentrator; not
intelligent

Answer 17

Hub

Question 18

Device that connects and passes packets between two network
segments,

Answer 18

Bridge

Question 19

How many addressing schemes are there in networking?

Answer 19

2
MAC address and IP address