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Computer Networks > Final > Flashcards

Final Flashcards

1
Q

RS-232 (Serial Ports) are

A

A. Only seen in old hardware
B. Still used even virtualized today
C. Not seen in modern equipment
D. Silly and should stop being used

Answer: B

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2
Q

SPI (Serial Peripheral Interface) bus is an example of which type of communication?

A

A. Synchronous
B. Asynchronous
C. Synchronicity
D. Parallel

Answer: A

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3
Q

RS232 or ‘Seral’ port use a common ground an

A 
A. A master in slave out, a master out slave in, a clock   
     and a slave select
B. A data and a clock wire
C. A transmit and a receive wire
D. 8 data wires and one strobe wire

Answer: C

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4
Q

What is the highest later of the OSI 7-layer network protocol?

A

A. Application
B. Presentation
C. Data Link
D. Transport

Answer: A

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5
Q

Old ‘Parallel’ ports use a common ground and

A 
A. 8 data wires and one strobe wire
B. A transmit and a receive wire
C. A master in slave out, a master out slave in, a clock 
     and a slave select
D. A data and a clock wire

Answer: A

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6
Q

If data is being transmitted at 9600 baud what is probably true about the wiring and hardware on both sides of the communication?

A

A. Must use Cat5 cable
B. The wires and hardware must be high quality
C. The wire and hardware can be poor quality
D. Must use Coaxial cable

Answer: C

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7
Q

TTL RS232 uses what voltage levels

A

A. 0V for 0 and 5V for 1
B. -3V for 0 and 3V for 1
C. -12V for 0 and 12V for 1
D. 5V for 0 and 0V for 1

Answer: A

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8
Q

I^2C is what kind of communication

A

A. Dumb
B. Synchronous
C. Asynchronous
D. Used for long distances

Answer: B

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9
Q

High speed data transmission requires

A

A. Better quality wire/fiber optics and less precisely timed
equipment
B. Better quality wire/fiber optics and more precisely
timed equipment
C. Lesser quality wire/fiber optics and more precisely
timed equipment
D. Lesser quality wire/fiber optics and less precisely
timed equipment

Answer: B

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10
Q

If you have a 10Mbps connection to your ISP you should expect

A

A. Between 100KBps and 1MBps download
B. Less than 100KBps download
C. More than 100KBps download
D. More than 1MBps download

Answer: A

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11
Q

A transmission approach that does have a separate clock line is said to be?

A

A. Synchronicity
B. Asynchronous
C. Synchronous
D. Unusable

Answer: C

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12
Q

SPI (Serial Peripheral Interface) has what baud rate?

A

A. Any
B. 1200
C. 300
D. 9600

Answer: A

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13
Q

What is the lowest layer of the OSI 7-layer network protocol?

A

A. Network
B. Physical
C. Data Link
D. Transport

Answer: B

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14
Q

SPI uses a common ground and

A 
A. A master in slave out, a master out slave in, a clock  
     and a slave select
B. A data and a clock wire
C. A transmit and a receive wire
D. 8 data wires and one strobe wire

Answer: A

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15
Q

To convert bps to Bps a quick rule is to

A

A. Divide by 10
B. Divide by 8 because there is 8 bits in a byte
C. Divide by 4 because sync bits occur every 4 bits
D. Multiply by 8 because there is 8 bits in a byte

Answer: A

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16
Q

A transmission approach that does not have a separate clock line is said to be?

A

A. Synchronous
B. Asynchronous
C. Synchronicity
D. Unusable

Answer: B

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17
Q

A simple transition from zero to one includes how many frequencies?

A

A. Only two frequencies the first and second harmonic
B. Only one frequency because there is only one change
C. An infinite number
D. Only three frequencies the first, third, and fifth
harmonic

Answer: C

18
Q

I^2C uses a common ground and

A 
A. A transmit and a receive wire
B. A data and a clock wire
C. A master in slave out, a master out slave in, a clock 
     and a slave select
D. 8 data wires and one strobe wire

Answer: B

19
Q

What is the minimum time it will take to transmit 2880 Bytes at 9600 baud?

A

A. 3(s)
B. .3(s)
C. 30(s)
D. Not enough information to computer an answer

Answer: A

20
Q

A simple on/off signal on a wire at a fixed frequency contains

A

A. Is never distorted by the wire it is transmitted on
B. Infinite harmonics
C. Just the fixed frequency
D. Unchanged by surrounding magnetic fields

Answer: B

21
Q

The port number for HTTP is?

A

A. 25
B. 80
C. 43
D. There is no port number

Answer: B

22
Q

DD-WRT is firmware from

A

A. Stock firmware for a router
B. An open source community for consumer routers
C. From the company that made the routers
D. Chip manufacturers

Answer: B

23
Q

A transmission approach that does not have a separate clock line is said to be?

A

A. Synchronicity
B. Asynchronous
C. Synchronous
D. Unusable

Answer: B

24
Q

DHCP performs what operations for networked devices?

A

A. Converts names like www.google.com to ip addresses
B. Hands out ip addresses to new machines that connect
C. Transfers packets from one connection to another
D. Maps WAN ip addresses to LAN ip addresses

Answer: B

25
Q

The C/C++ function ‘bind’ is the moment in code where the _____ gets exclusive hold of the socket?

A

A. Web browser
B. Server
C. Client
D. PING

Answer: B

26
Q

Bits or bytes of information to verify that both sides of a communication have the same data at the end of reception are named?

A

A. Stop
B. Framing
C. CRC
D. Header

Answer: C

27
Q

How many clients can connect on a socket on port 1025

A

A. Infinite or limited to number of process in the operating
system
B. 1 because it binds the socket
C. 2 because there is the server application as well
D. 65535 because it uses a two byte integer for
numbering the port

Answer: A

28
Q

Which protocol has acknowledgements of Datagrams received?

A

A. IP
B. TCP
C. UDP
D. SMTP

Answer: B

29
Q

How many servers can use a socket on port 1025

A

A. 1 because it binds the socket
B. 2 because there is the client application as well
C. Infinite or limited to number of process in the operating
system
D. 65535 because it uses a two byte integer for
numbering the port

Answer: A

30
Q

The C/C++ function ‘connect’ is the moment in code where the _____ makes a connection over the network?

A

A. Server
B. Client
C. Web Browser
D. PING

Answer: B

31
Q

If you want to send a packet of information over the network and your protocol does not care if it arrives you are probably using?

A

A. UDP
B. TCP
C. IP
D. SMTP

Answer: A

32
Q

If data is being transmitted at 9600 baud what is probably true about the wiring and hardware on both sides of the communication?

A

A. The wires and hardware must be high quality
B. Must use Cat5 cable
C. The wire and hardware can be poor quality
D. Must use coaxial cable

Answer: C

33
Q

DNS performs what operations for networked devices?

A

A. Transferes packets from one connection to another
B. Hands out ip addresses to new machines that connect
C. Converts names like www.google.com to ip addresses
D. Maps WAN ip addresses to LAN ip addresses

Answer: C

34
Q

A router performs what operations for networked devices?

A

A. Hands out ip addresses to new machines that connect
B. Converts names like www.google.com to ip addresses
C. Transfers packets from one connection to another
D. Maps WAN ip addresses to LAN ip addresses

Answer: All of the above

35
Q

NAT performs what operations for networked devices?

A

A. Maps WAN ip addresses to LAN ip addresses
B. Hands out ip addresses to new machines that connect
C. Converts names like www.google.com to ip addresses
D. Transfers packets from one connection to another

Answer: A

36
Q

If you want to send a file over the network and the protocol preserves order of packets, you are probably using?

A

A. TCP
B. UDP
C. IP
D. SMTP

Answer: A

37
Q

When a user copies a file over a network it is usually

A

A. Moved as one large packet of bytes
B. Chopped into pieces and sent in pieces
C. Not sent over a network
D. Compressed the bytes, then sent as one large packet
of bytes

Answer: B

38
Q

Bits or Bytes of data to synchronize the timing on both sides of a communication channel are usually named?

A

A. Checksum
B. CRC
C. Framing
D. Header

Answer: C

39
Q

Most networks today are of a ______ configuration?

A

A. Star
B. Ring
C. Cube
D. Square

Answer: A

40
Q

What is special about port numbers less than 1024

A

A. Now are used only by root/super user accounts
B. Originally they were reserved for regular userservers
C. Originally they were reserved for root/super user
privileged servers
D. There is not special about port numbers less than 1024

Answer: C

Computer Networks (3 decks)

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