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CMPS 329 MidTerm > MidTerm > Flashcards

MidTerm Flashcards

1
Q

What is a device that filter traffic based on the source or destination addresses?

A

Firewall

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2
Q

A model used in networking which breaks up communications into 7 abstract layers. The layers communicate with each other using encapsulation.

A

An OSI model

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3
Q

This is used to securely access resources over a non-secure public network connection, using an encrypted tunnel

A

VPN

Virtual Private Network

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4
Q

Modifies IP headers to change the source/destination IP/Ports for the purposes of mapping one address to another. It can be used to let many devices on a private network all share one public IP address

A

NAT

Network Address Translation

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5
Q

Describe the 3-way TCP handshake

A

Starts off a TCP connection.
Host A sends a packet with the SYN flag set.
Host B responds with a SYN/ACK.
Host A then confirms the connection by sending an ACK

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6
Q

Give an example of a Layer 1 medium

A

copper or fiber

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7
Q

Give an example of link-state routing protocol

A

OSPF or IS-IS

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8
Q

How many bits is an IPv4 address?

A

32 bits

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9
Q

How many bits is this subnet: 255.255.255.0

A

24

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10
Q

How many individual copper wires are in a Cat5e cable?

A

8

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11
Q

How many layers are in the OSI mode?

A

7

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12
Q

If your network address is 192.168.12.0/24, how many IP address are available on this network?

A

256 total, 254 usable

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13
Q

In TCP, what happens if a packet is lost?

A

TCP will notice a packet that is not acknowledged and re transmit it.

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14
Q

In TCP, what’s the purpose of the FIN packet?

A

To end a TCP connection nicely

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15
Q

In TCP connection, when the sender advertises a window size, what does this tell the receiver

A

This tells the receiver how much data the sender is willing to accept

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16
Q

In which layer does the Ethernet “switch” run?

A

Layer 2

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17
Q

Is the IP protocol ““best effort”” or does it guarantee delivery?

A

Best effort

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18
Q

List an advantage of using layer protocols

A

Abstraction, One layer can be changed without affecting others later.

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19
Q

List disadvantage of using layer protocols

A

A disadvantage is the overhead of going through so many layers. Doing slow may slow down communications

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20
Q

List the layers of the OSI model

A 
Physical
Data
Network
Transport
Session
Presentation
Application
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21
Q

What is the advantage of fiber optic over copper cabling

A

it has more bandwidth, and can be stretched a further distance.

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22
Q

What does a switch store in its forwarding table?

A

MAC addresses and ports

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23
Q

What is CSMA/CD?

A

It is one of the protocols used in Ethernet.

Carrier Sense- the device can tell when someone is talking on the channel or when the channel is idle.

Multiple Access – let’s multiple devices use the same channel.

Collision Detection – detection when two devices talk and the same time and their frames.

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24
Q

What is DHCP used for

A

Dynamic Host Protocol, used to distribute network information (IP, Net mask, DNS, router, etc) to client.

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25
Q

What is DNS root server?

A

One of 13 servers around the globe responsible for handling top level domain name requests

26
Q

What is encapsulation?

A

Adding more data to a packet as it travels down the layers of the OSI model.

27
Q

What is the ping of death?

A

A malicious attack used by sending an oversize ping request. The victim would not expect a ping of this size and would typically crash.

28
Q

What is the purpose of a Regional Internet Registry, such as ARIN?

A

To distribute IP blocks in region of the world.

29
Q

What is the purpose of networking?

A

To communicate

30
Q

What type of address is hard coded into an Ethernet adapter?

A

MAC address

31
Q

What type of address is this : 00:25:4b:a0:c2:d0 ?

A

MAC address

32
Q

What’s a common frequency that wireless networks use?

A

2.4 GHz or 5 GHz

33
Q

What’s a common protocol that runs at Layer 2?

A

Ethernet, ADSL, DOCSIS

34
Q

What’s a common protocol that runs at Layer 3?

A

IP

35
Q

What’s an advantage of a Ethernet switch over an Ethernet hub

A

A switch is “smart” and learns which devices are plugged into which ports, and will not broadcast unneeded data across the network.

36
Q

What is the purpose of a CNAME record in DNS

A

Canonical name is a DNS alias.

37
Q

What is a cache?

A

When a DNS server looks up an address, it may store the response in case another client later asks for the same address.

38
Q

When would you want to use a protocol where it doesn’t matter if you lose packets?

A

When transmitting real-time data such as voice and video

39
Q

Which is more susceptible to electro-magnetic interference, copper or fiber.

A

Copper

40
Q

Which routing protocol let’s autonomous systems share routing information and build the global internet routing

A

BGP

41
Q

Which type of network topology has more redundancy, star or ring?

A

Ring

42
Q

Who invented Ethernet?

A

Bob metcalfe and Dave Boggs

43
Q

Which protocol will re transmit a lost packet?

A

TCP

44
Q

The order of rules in a firewalll is important? T or F?

A

true

45
Q

Switch vs Hub

A

Switch learns which devices are on which ports on mac address tables

Hub just broadcasts everything to every port

46
Q

Switch vs Router

A

Switch is layer 2 and talks about MAC address

Router is layer 3 talks about IP address

47
Q

What does ARP dp?

A

It turns IP to MAC address

48
Q

What port is “SSH” on?

A

22

49
Q

What port is “SMTP” on?

A

25

50
Q

What port is “DNS” on?

A

53

51
Q

What port is “HTTP” on?

A

80

52
Q

What port is “HTTPS” on?

A

443

53
Q

What port is “FTP on?

A

21

54
Q

What port is “TelNet on?

A

23

55
Q

What is “a record”

A

IP address

56
Q

What is “C name record”

A

Alias

57
Q

What is “Ns Record”

A

Name server record

58
Q

What is “Mx record”

A

Mail exchange.

59
Q

What is DNS cacheing?

A

Server learns address and knows it for certain amount of time.

60
Q

What are Root Servers?

A

13 servers on planet that run DNS for the world.

CMPS 329 MidTerm (2 decks)

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