Networking I				Name:
Fall 1997
Test #1					(ID):



1.	Name four different kinds of data transmission media:

copper cables/wires
fiber optic cables
infrared
laser
microwave
radio

2.	What is CSMA/CD (what does it stand for)?

Carrier Sense Multiple Access with Collision Detection

3.	Name three services provided by the OSI physical layer:

how bits are represented:  analog, digital
how to represent the start and end of a transmission
whether bits can move in only one or in both directions at once (half or full duplex)

4.	Name three services provided by the OSI link layer:

framing
error detection
error correction (retransmission)
flow control

5.	Name two services provided by the OSI network layer:

unified addressing scheme
routing
transmitting data to adjacent nodes

6.	Name three services provided by the OSI transport layer:

end-to-end connectivity (transmit to remote node, not just adjacent)
addresses particular processes on a node
connection management
flow control
buffering
resource utilization:  multiplexing, parallelization

7.	Name three services provided by the OSI session layer:

session management:  multiple sessions per transport connection, or one session
	over multiple transport connections
conducting dialogs through the use of tokens
sync points
activities

8.	Name three services provided by the OSI presentation layer:

data representation:  EBCDIC, ASCII, ASN.1
data security:  unauthorized use of network, false identification, eavesdropping/sniffing,
	inserting/removing data
data compression

9.	Name two types of programs which operate in the OSI application layer:

user applications:  email, news
application services:  nfs, network drives

10.	What kind of cable is used in a 10Base-T network?

twisted pair copper wire, usually unshielded

11.	What is the maximum segment length (node to node) in a 10Base-T network?

100m

12.	Name one difference between a bridge and a router.

Bridges operate in the OSI link layer.  Routers operate in the OSI network layer.
Bridges can translate data from one communications medium onto another.  Routers
	only work across the same kind of medium.

13.	Explain the difference between baseband and broadband signalling.

Baseband is a digital transmission in which each medium carries only one channel (signal).
Broadband is an analog transmission which permists each medium to carry multiple channels.

14.	What is PGP?  Provide a functional definition.

Pretty Good Privacy:  public key encryption system using RSA and IDEA algorithms
to provide secure, encrypted communications through a public network

15.	Given the following UNIX commands, 
		# ls 
		help  me
		# cat help
		Find me.
		# cat me
		I'm lost.
		# cat help >> me

	What is the output of each of the following command?
		# cat me

I'm lost.
Find me.

16.	Given the above (question 15), what is the output of the following command?
		# grep I me

I'm lost.

17.	What command do you execute to change your password under UNIX?

passwd

18.	Name two functions of domain name service (DNS).

IP address to fully qualified domain name translation (FQDN) (and vice versa)
email routing

19.	What is the netmask for a Class C network with an ip address of 205.222.72.0 if it is not
	subnetted further? (dotted decimal notation)

255.255.255.0

20.	What is the broadcast address for 205.222.72.65/24?

205.222.72.255