TCP is responsible for breaking large files received from the application layer into smaller packets and opening a connection to a server for transferring the packets. What layer is this?
Definition
The Transport layer. (layer 4)
Term
What is the size of this plain-text document in bits?
[image]
Definition
3560 (445 x 8)
Term
What layer corresponds in the internet model to the session, presentation and application layers from osi model.
Definition
Application layer.
Term
What is this service based on? Onlive Desktop?
Definition
Host based architecture
Thin client
Three-tier Architecture
Term
What is an orderly close to a dialogue between end users.?
Definition
Session Termination.
Term
What protocols are email based off of?
Definition
SMTP
CMC
POP
IMAP
Term
A Network server computer allows?
Definition
Multiple clients to access data and software over the network.
Term
In peer-to-peer networks a computer can do what?
Definition
Act as a server and client at the same time.
Term
One underlying problem with a host-based network is that?
Definition
The server can get overloaded since it must process all messages
Term
What third party software is widely used in Client-server network application architecture that allows proper communication, translation and message transfer between software components from different vendors is what?
Definition
Middleware
Term
With the “thin client” architecture, when an application changes, only the _________ with the application logic needs to be updated.
Definition
server
Term
What are the only things a computer terminal can do?
Definition
it has a monitor, keyboard, but typically no storage device, like hard disk.
it can typically process only character based input and output.
Term
Match the technology to the right frequencies:
AM Radio Broadcasting
D.
1 to 2 GHz
Cellular phones
A.
20Hz to 20kHz
FM Radio Broadcasting
C.
500 to 1500kHz
Audio Spectrum
E.
50 to 1000MHz
TV Broadcasting
B.
88 to 108MHz
Definition
Cellular phones
D.
1 to 2 GHz
Audio Spectrum
A.
20Hz to 20kHz
AM Radio Broadcasting
C.
500 to 1500kHz
TV Broadcasting
E.
50 to 1000MHz
FM Radio Broadcasting
B.
88 to 108MHz
Term
When converting analog signal to digital using pulse amplitude modulation (or sampling) and using 64 amplitude levels, how many bits per sample are needed?
Definition
6
Term
Order following network media from least secure first (easiest to eavesdrop on the signal) to most secure last (hardest to eavesdrop on the signal).
1.
coaxial cable
2.
fiber optic cable
3.
unshielded twisted pair
4.
infrared
5.
shielded twisted pair
Definition
1.
infrared
2.
unshielded twisted pair
3.
shielded twisted pair
4.
coaxial cable
5.
fiber optic cable
Term
The communication path is traversing over several physical sub-circuits with these characteristics:
- 10 Tbps; full duplex;
- 20 Gbps; half duplex
- 30 Mbps; simplex
- 40 kbps; full duplex
Definition
40 kbps
simplex
Term
If the highest frequency of a circuit is 10 KHz and the lowest frequency is 900 Hz, the available bandwidth for this circuit is _____ in Hz.
Definition
9100 (Highest freq. minus the lowest freq)
Term
If you download a 15-page paper of 160 KBytes, how long would it take to transfer it over the following circuits? Assume the control characters add an extra 15 % to the message. Enter rounded numbers (no decimal places):
- Dial-up modem at 33.6Kbps [a] seconds,
- Cable modem at 384 Kbps [b] seconds,
- Cable modem at 1.5Mbps [c] seconds,
- If the modem includes V.44 data compression with 6:1 data compression ratio, what is the data rate you would actually see using the cable modem at 1.5Mbps [d] Mbps.
Definition
1. 44
2. 4.
3. 1
4. 9
Term
What is the freqency that humans can hear?
Definition
20hz to 20000hz
Term
The longer the cable length the __________
Definition
The lower the usable bandwidth
Term
Inverse multiplexing means?
Definition
Combining several low speed circuits to enable them to be transmitted across one high speed circuit
Term
What is the circuit data rate in kilo-bits per second (kbps) if using modulation with symbol rate of 8kHz and 16 bits per symbol?
Definition
128 (8x16)
Term
What are the functions of the physical layer?
Definition
transmission of bits
defining the rules by which one and zeroes are transmitted
specifying the type of connection and type of signals, waves or pulses that pass though it
Term
When sending four bits per one symbol using frequency modulation, the number of different frequencies needed would be _______.
Definition
16
Term
To increase the LAN circuit bandwidth you will have to?
Definition
upgrade to a bigger circuit
Term
If a computer transmits a message containing “ABC” and the destination computer receives “abc” as the message, is the message corrupted?
Definition
Yes. It is not 100% the same.
Term
What is Synchronous transmission?
Definition
Transmitting a “frame” or “packet” of data at a time.
Term
What is commonly used with Ethernet local area networks to decide who gets to transmit when?
Definition
contention method.
Term
If a computer is sending network trafic to another computer that is not on the same network segment (subnet), where will he send the trafic?
Definition
Default Gateway
Term
How would one compensate for attenuation of media?
Definition
Adding repeaters or amplifiers to a circuit.
Term
For effective error detection and correction what must be added?
Definition
Extra error checking bits.
Term
When we amplify the signal on an analog circuit, what also is amplified?
Definition
The noise
Term
What is an effective way to prevent impulse noise, cross talk, and intermodulation noise?
Definition
Shielding the wires.
Term
What is the simplest method for error correction?
Definition
Retransmission
Term
The loss of power a signal suffers as it travels from the transmitting computer to a receiving computer is?
Definition
attenuation
Term
The probability of detecting an error, provided that one has occurred, using crc is?
Definition
<99% (not quite 100%)
Term
In data transmission, data errors are uniformly distributed in time.
Definition
False
Term
Crosstalk is when?
Definition
the signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.
Term
The probability of detecting an error, given that one has occurred, using parity checking is about:
Definition
50%
Term
Errors on a network can occur:
Definition
Due to noise on a line.
Guassian Noise.
Badly maintained or faulty equipement.
Term
How efficient (in %) would a 8 bit code be in asynchronous transmission if it had 0 parity bit, 1 start bit and 1 stop bits?
Definition
80%
Term
What is the efficiency (in %) if a 2,000 byte file is transmitted using Ethernet? (assume the Ethernet II frame layout with 24 bits of overhead)
Definition
97.46% (Can't be over 1500 bits so split into two packets. which makes 48 bits of overhead. 2000/2048 = 97.5%)
Term
What is the result of adding these binary numbers:
1001
+ 110
---------
Definition
1111
Term
How many decibel is the ratio of electric power: 0.001?
Definition
-30db (10 power to 3)
Term
An advantage of centralized routing is?
Definition
Routing decisions are easy because the routing table is kept on one computer.
Term
Match each subnet mask to the correstponding slash notations:
255.255.0.0
[image]4.
/8
255.0.0.0
[image]3.
/24
255.255.255.0
[image]1.
/25
255.255.255.128
[image]2.
/16
Definition
Question
Correct Match
255.0.0.0
4.
/8
255.255.255.0
3.
/24
255.255.255.128
1.
/25
255.255.0.0
2.
/16
Term
To send network traffic outside of the local network segment (subnet), the device will use the?
Definition
Default Gateway
Term
One drawback to dynamic routing is?
Definition
The transmission of status information “wastes” network capacity that could be used to send user messages
Term
What is this? :80
Definition
port number for http
Term
what is this? 00-0F-00-81-14-00
Definition
MAC address
Term
What is this? 10.20.30.40
Definition
IP address
Term
What is this? www.nvcc.edu
Definition
Domain name
Term
What provides the equivalent of directory assistance for application layer addresses?
