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CS 372 > export_week 7 summary exercises > Flashcards

export_week 7 summary exercises Flashcards

1
Q

TCP has a congestion control mechanism.

A

True

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2
Q

What are some causes of network congestion? (Check all that apply)

A
  • Reliable Data Transfer schemes
  • Dropped TCP Packets
  • Parallel TCP Connections
  • Typical Internet Usage
  • High Utilization
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3
Q

The rate of CongWin size increase (in terms of MSS) while in TCP’s Slow-Start phase is _______.

A

Exponential

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4
Q

In _____ congestion control, congestion is detected based on delayed and/or dropped packets.

A

Linear

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5
Q

Given a 2 Gbps link with TCP applications A, B, and C.

  • Application A has 33 TCP connections to a remote web server
  • Application B has 2 TCP connection to a mail server
  • Application C has 14 TCP connections to a remote web server.

According to TCP “fairness”, during times when all connections are transmitting, how much bandwidth should Application C have? (Give answer in Mbps, rounded to one decimal place, without units. So for an answer of 1234,567,890 bps you would enter “1234.6” without the quotes.)

A

571.4

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6
Q

For the following binary IP address, give the dotted-decimal representation:

11000000 10101000 00001011 00010100

A

192.168.11.20

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7
Q

For the following dotted-decimal IP address, give the binary representation:

156.224.141.227

A

10011100 11100000 10001101 11100011

10011100111000001000110111100011

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8
Q

For the following dotted-decimal IP address, give the binary representation:

155.124.185.14

A

10011011011111001011100100001110

10011011 01111100 10111001 00001110

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9
Q

Which of the following are benefits of a datagram network? (Check all that apply)

A
  • Fast Delivery

* Less Overhead than a VC network

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10
Q

In a subnet, there are ___ reserved IP addresses.

A

2.0

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11
Q

The Internet Protocol (IP) header may be 21 bytes long.

A

False

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12
Q

In a subnet, the reserved addresses are the ______ (with a lowest subnet IP address) and the ______(with a highest subnet IP address).

A
  • Subnet Address

* Broadcast Address

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13
Q

The process of moving a datagram from a router’s input port to output port is handled by the _______.

A

Switching Fabric

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14
Q

The Internet Protocol (IP) implements data reliability services.

A

False

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15
Q

In a datagram network, the responsibilities of the network layer include: (check all that apply).

A
  • Packet Forwarding
  • Host-to-host communication
  • Packet Routing
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16
Q

When a host in a network needs to obtain a valid IP address for itself, it broadcasts a “discover” message that can be handled by a _________ server, which will “offer” an IP address within the correct domain.

A

Dynamic Host Configuration Protocol (DHCP)

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17
Q

Given a router with 5 input ports and 5 output ports. If the switching fabric is 5 times as fast as the input/output line speed, queueing ______ occur at an output port.

A

can

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18
Q

The process of determining a path through the internet is handled by the ________.

A

Routing Algorithm

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19
Q

A network with a connectionless network layer is called a ______.

A

datagram network

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20
Q

The Internet Protocol (IP) implements congestion control.

A

False

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21
Q

A group of hosts sharing a common address prefix, behind a router, is called a/an _______.

A

subnet

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22
Q

The network layer manages communications from _____ to ______.

A
  • host

* host

23
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240EAC8A912EF4A2B.jpg

A

Port 2

24
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240EB318E6B1826DB.jpg

A

Port 4

25
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240EBCFAC26965210.jpg

A

Port 3

26
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240ECA32F36752E3E.jpg

A
  1. Jetpack
  2. DHCP Discover
  3. MAC Broadcast address
  4. Rhino
  5. DHCP Offer
  6. Jetpack’s MAC address
  7. Jetpack
  8. DHCP Request
  9. MAC Broadcast address
  10. Rhino
  11. DHCP Acknowledgement
  12. Jetpack’s MAC address
27
Q

For the IPv4 CIDR address 153.10.22.56 /22

What is the…

Netmask:

Network Address:

Host Mask:

Broadcast Address:

Number of possible hosts:

Host Number:

A
  • 255.255.252.0
  • 153.10.20.0
  • 0.0.3.255
  • 153.10.23.255
  • 1022
  • 568
28
Q

Select the proper equation for TCP’s calculation of EstimatedRTT.

A

EstimatedRTTn = (1 - a) * EstimatedRTTn-1 + a * SampleRTTnew

29
Q

The rate of CongWin size increase (in terms of MSS) while in TCP’s Congestion Avoidance phase is _____.

A

Linear

30
Q

TCP implements network fairness directly.

A

False

31
Q

UDP has a congestion control mechanism.

A

False

32
Q

A host starts a TCP transmission with an EstimatedRTT of 25.8ms (from the “handshake”). The host then sends 3 packets and records the RTT for each:

SampleRTT1 = 23.5 ms

SampleRTT2 = 30.8 ms

SampleRTT3 = 31 ms

(NOTE: SampleRTT1 is the “oldest”; SampleRTT3 is the most recent.)

Using an exponential weighted moving average with a weight of 0.4 given to the most recent sample, what is the EstimatedRTT for packet #4? Give answer in miliseconds, rounded to one decimal place, without units, so for an answer of 0.01146 seconds, you would enter “11.5” without the quotes.

A

28.7

33
Q

For the following binary IP address, give the dotted-decimal representation:

10011000 11101110 10011101 11000011

A

152.238.157.195

34
Q

For the following dotted-decimal IP address, give the binary representation:

155.124.185.14

A

10011011 01111100 10111001 00001110

10011011011111001011100100001110

35
Q

For the following binary IP address, give the dotted-decimal representation:

11000000 10101000 00001011 00010100

A

192.168.11.20

36
Q

The process of moving a datagram from a router’s input port to output port is handled by the _______.

A

Switching Fabric

37
Q

In addition to a “default” entry, routing tables in an internet store…

A

the “first hop” in a path to each of the networks known to the router

38
Q

In a link between Host A, and Host B, we have three intermediary routers:

Host A —– Router Snucky —— Router Jumpy —— Router Po ——- Host B

Host A’s first hop router is Router _____.

A

Snucky

39
Q

Which of the following are benefits of a datagram network? (Check all that apply)

A
  • Faster Delivery

* Less overhead than a VC network

40
Q

The Internet Protocol (IP) header may be 28 bytes long.

A

True

41
Q

Given a router with 5 input ports and 5 output ports. If the switching fabric is 5 times as fast as the input/output line speed, queueing _____ occur at an output port.

A

can

42
Q

In a subnet, the reserved addresses are the _____ (with a lowest subnet IP address) and the _____ (with a highest subnet IP address).

A
  • Subnet Address

* Broadcast Address

43
Q

In a datagram network, the responsibilities of the network layer include: (check all that apply).

A
  • Packet Forwarding
  • Packet Routing
  • Host-to-host communication
44
Q

What can cause packet queueing at a router’s output port? (Check all that apply)

A
  • Multiple data flows requiring the same output link

* Slow outbound link Transmission rate.

45
Q

The process of determining a path through the internet is called _____.

A

Routing

46
Q

What can cause queueing at a router’s input ports? (Check all that apply)

A
  • Output port contention
  • Head of Line Blocking
  • Slow output link transmission rate
47
Q

A network with a connection-oriented network layer is called a ________.

A

virtual circuit network

48
Q

The Internet Protocol (IP) header may be 21 bytes long.

A

False

49
Q

A network with a connectionless network layer is called a ________.

A

Datagram Network

50
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240F7AFD744B0AFD2.jpg

A

Port 4

51
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240F7F9BB6A7BF4F3.jpg

A

Port 2

52
Q

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240F8D7595C30D1ED.jpg

A
  1. Jetpack
  2. DHCP Discover
  3. MAC broadcast address
  4. Rhino
  5. DHCP Offer
  6. Jetpack’s MAC address
  7. Jetpack
  8. DCHP Request
  9. MAC broadcast address
  10. Rhino
  11. DHCP Acknowledgement
  12. Jetpack’s MAC Address
53
Q

For the IPv4 CIDR address 153.10.22.56 /22

What is the…

Netmask:

Network Address:

Host Mask:

Broadcast Address:

Number of possible hosts:

Host Number:

A
  1. 255.255.252.0
  2. 153.10.20.0
  3. 0.0.3.255
  4. 153.10.23.255
  5. 1022
  6. 568

CS 372 (13 decks)

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