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CSCI6708 NetworkSec > Module 0 > Flashcards

Module 0 Flashcards

1
Q

If the following layer in TCP/IP is not present, data cannot be digitized.

a. network
b. data link
c. transport
d. physical

A

physical

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2
Q

If the following layer in TCP/IP is not present, data cannot be routed.

a. network
b. data link
c. transport
d. physical

A

network

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3
Q

Which TCP/IP layer defines LAN and WAN protocols?

a. network
b. data link
c. transport
d. physical

A

data link

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4
Q

A host receives a frame and discards it after deterring that it is corrupt. At which TCP/IP layer are frames checked for errors.

a. application
b. network
c. physical
d. data link

A

data link

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5
Q

Which layer has changed the most in IP version 6 (IPv6) from IPv4 ?

a. network
b. data link
c. transport
d. physical

A

network

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6
Q

Which of the flowing interconnection devices separates LANs into different collision domains?

a. routers only
b. routers and switches
c. routers, switches and bridges
d. routers, switches, bridges and repeaters

A

c. routers, switches and bridges

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7
Q

Which of the flowing interconnection devices separates LANs into different broadcast domains?

a. routers only
b. routers and switches
c. routers, switches and bridges
d. routers, switches, bridges and repeaters

A

a. routers only

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8
Q

Into how many classes are IP version 4 (IPv4) address divided?

a. 2
b. 3
c. 4
d. 5

A

d. 5

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9
Q

How many IPv4 class can be used to address individual hosts?

a. 2
b. 3
c. 4
d. 5

A

b. 3

Class A,B,C

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10
Q

The last block of IPv4 address was given away in?

a. 1999
b. 2000
c. 2008
d. 2011

A

d. 2011

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11
Q

How can organization build more networks if there are no more IPv4 address?

a. The only solution is to use IPv6
b. Use an intermediary protocol IPv5
c. Use NAT and private addressing
d. Use supernetting

A

c.Use NAT and private addressing

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12
Q

The flowing is a loop back address

a. 10.25.0.127
b. 192.13.5.127
c. 255.255.255.255
d. 127.0.0.1

A

d. 127.0.0.1

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13
Q

The IP address 255.255.255.0 is a

a. default class A mask
b. default class B mask
c. default class C mask
d. default class D mask

A

c.default class C mask

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14
Q

The IP address 192.161.255.255 is a

a. host IP address
b. router IP address
c. gateway IP address
d. broadcast IP address

A

d. broadcast IP address

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15
Q

ping uses which protocol?

a. IP
b. ARP
c. IGMP
d. ICMP

A

d. ICMP

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16
Q

If a router does not know the MAC address of a host on its network, it uses the following protocol to find it:

a. IP
b. ARP
c. IGMP
d. ICMP

A

b. ARP

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17
Q

If a host wants to find its IP address, it uses the following protocol to find it:

a. IP
b. ARP
c. IGMP
d. DHCP

A

d. DHCP

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18
Q

What is the static version of DHCP?

a. SHCP
b. ICMP
c. IGMP
d. BOOTP

A

d. BOOTP

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19
Q

Which of the following application layer protocol uses both TCP and UDP ports?

a. FTP
b. TFTP
c. DNS
d. SSH
e. Telnet

A

c. DNS

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20
Q

What is the frame format ?

A

source MAC | destination MAC | source IP | destination IP | source port | destination port | data

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21
Q

what are the ports of FTP? and what are they used for ?

A

File Transfer Protocol
2 ports
port 20 use to transfer data
port 21 use to send command

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22
Q

What is SSH port number?

A

port 22 Secure Shell

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23
Q

What are the basic building blocks of network ?

A
  • Nodes
    hosts -end devices
    interconnection devices -intermediate devices(repeater, hubs, bridges, switches, routers and gateways)
  • Links
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24
Q

what is “two node point to point topology”?

A

node - link - node

- two nodes connected by one link

25
Q

what is “linear topology” ?

A

node - link - node - link …….

  • Multiple point-to-point connections in a linear fashion
  • problems:
    data may go through other nodes
    bandwidth utilization
26
Q

what is bus topology ?

A
  • linear topology but share a single link.
  • problems:
    transmissions may collide
27
Q

what is ring topology ?

A
  • Multiple nodes share a single link connected as a ring
28
Q

what is dual ring topology ?

A
  • two counter rotating rings

- fix fault tolerance

29
Q

what is star topology ?

A
  • multiple nodes connected to a central hub.
  • data board cast to all nodes
  • Local are network(LAN) based on this.
30
Q

what is mesh topology ?

A
  • multiple point to point links connected in an arbitrary topology.
  • can be full mesh or partial.
31
Q

what are the interconnection devices ?

A
  • repeater/hub
  • switch/ bridge
  • router
  • gateway
32
Q

what does repeater/hub do ?

A
  • simple length extension
  • cannot filter frames
  • only physical layer
33
Q

what does switch /bridge do?

A
  • length extension
  • filtering
  • works on data link layer and physical layer
  • can connect different speed LANs
34
Q

what does router do ?

A
  • length extension
  • filtering
  • interconnection of two different topologies
  • layer 3 device,
  • network layer, data link, physical layer.
35
Q

what does gateway do ?

A

-interconnection of two different protocols

36
Q

what are the five layers of network ?

A

5: application
4: transport
3: network
2: data link
1: physical

37
Q

what is the application layer and examples of protocols ?

A
  • user interface to network services

- FTP, HTTP, HTTPS, SSH, DNS, BGP, Telnet, Rlogin, DHCP

38
Q

what is the transport layer and examples of protocol ?

A
  • end-to-end data transfer: connection management, data segmentation
  • TCP, UDP
39
Q

what is the network layer and examples of protocol ?

A
  • network to network data transfer: path determination and routing.
  • IP, RIP, OSPF, ARP, RARP, IGMP, ICMP
40
Q

what is the data link and physical layer and examples of protocol ?

A

data transfer on a network:
medium access control, error control, bits to signal conversion.
-LAN, WAN protocols (IEEE 802.3, 802.5, 802.11)
- SLIP, PPP, Frame Relay

41
Q

what is data encapsulation /decapsulation ?

A

application-data
transport-TH data
network- NH TH data
data link- DH NH TH data DT

42
Q

what is the range of ephemeral port ?

A

49152-65535

random port numbers

43
Q

what is standard port number ?

A

0-1023

44
Q

what is registered port number ?

A

1024- 49151

eg, google talk Skype

45
Q

what is the layer of BGP ?

A

application layer

46
Q

what is the layer of DHCP ?

A

application layer

47
Q

what is the layer of SLIP ?

A

data link physical layer

48
Q

what is the layer of UDP ?

A

transport layer

49
Q

what is the layer of IEEE 802.11

A

data link layer

50
Q

what is the layer of PPP ?

A

data link layer

51
Q

what is the layer of IP ?

A

network layer

52
Q

what is the layer of SNMP ?

A

application

53
Q

what is the layer of OSPF ?

A

network layer - routing protocol

54
Q

what is the layer of TFTP ?

A

application

55
Q

what is the layer of RARP ?

A

network layer

56
Q

what is the layer of DNS ?

A

application

57
Q

what is the layer of LAN and WAN ?

A

data link and physical layer

58
Q

what are the functions of router?

A
  • frame conversion - convert different types of network eg token ring, mesh
  • path determination - find shortest path through routing table
  • routing tables are build by routing protocols eg, RIP OSPF
59
Q

what are the classes in IPV4

A

a, large network - 0.0.0.0 to 127.255.255.255
b, medium network - 128.0.0.0 to 191.255.255.255
c, small network - 192.0.0.0 to 223.255.255.255
d, multicast -224.0.0.0 to 239.255.255.255
e, experimental - 240.0.0.0 to 247.255.255.255

CSCI6708 NetworkSec (14 decks)

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