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CSE 548: Advanced Network Security > Week 1: Computer Network Foundatoins > Flashcards

Week 1: Computer Network Foundatoins Flashcards

1
Q

Which layer links the network support layers and user support layers?

a. Physical Layer
b. Data Link Layer
c. Transport Layer

A

c. Transport Layer

The physical, data link and network layers are network support layers and session, presentation and application layers are user support layers.

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2
Q

Which layer is responsible for process to process delivery?

a. Transport Layer
b. Network Layer
c. Data Link Layer

A

a. Transport Layer

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3
Q

Routers operate at which layer of the OSI model?

a. Network Layer
b. Physical Layer
c. Transport Layer

A

a. Network Layer

The network layer is responsible for packet forwarding and routing.

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4
Q

In the TCP IP Model, when data is sent from device A to device B, what is the 4th layer to receive data at B?

a. Application Layer
b. Data Link Layer
c. Transport Layer

A

a. Application Layer

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5
Q

The application layer provides the basis for what?

a. Frame Division
b. Email Services
c. Error Control

A

b. Email Services

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6
Q

Which layer is used to deal with mechanical and electrical specifications?

a. Transport Layer
b. Physical Layer
c. Network Layer
d. Data Link Layer

A

b. Physical Layer

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7
Q

What service can be used to allocate IP addresses for hosts?

a. DHCP
b. DNS
c. ARP
d. NAT

A

a. DHCP

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8
Q

What service can be used to allocate IP addresses for hosts?

a. DHCP
b. DNS
c. ARP
d. NAT

A

a. DHCP

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9
Q

What is the correct order of the OSI Model?

a. Network Layer
b. Data Link Layer
c. Transport Layer
d. Application Layer
e. Session Layer
f. Presentation Layer
g. Physical Layer

A

d. Application Layer
f. Presentation Layer
e. Session Layer
c. Transport Layer
a. Network Layer
b. Data Link Layer
g. Physical Layer

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10
Q

What is the correct order of the TCP/IP Model?

a. Transport Layer
b. Application Layer
c. Network Interface Layer
d. Internet Layer

A

b. Application Layer
a. Transport Layer
d. Internet Layer
c. Network Interface Layer

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11
Q

What are the pros of subnetting?

a. Assigns IP address more effectively
b. Adds a layer of complexity
c. Speeds up the network
d. Easy to organize the network resources
e. Difficult to change once hierarchy is established
f. Improves security

A

a. Assigns IP address more effectively
c. Speeds up the network
d. Easy to organize the network resources
f. Improves security

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12
Q

What are the pros of subnetting?

a. Assigns IP address more effectively
b. Adds a layer of complexity
c. Speeds up the network
d. Easy to organize the network resources
e. Difficult to change once hierarchy is established
f. Improves security

A

a. Assigns IP address more effectively
c. Speeds up the network
d. Easy to organize the network resources
f. Improves security

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13
Q

How can we address the problem of adding layers of security and difficulty to change once hierarchy is established with standard subnetting?

A

We solved this by introducing CIDR (Classless Inter-Domain Routing)

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14
Q

How can we address the problem of adding layers of security and difficulty to change once hierarchy is established with standard subnetting?

A

We solved this by introducing CIDR (Classless Inter-Domain Routing)

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15
Q

What is a unicast address?

a. Address of a set of interfaces
b. Address of a single interface
c. Delivery to single interface
d. Address of a set of interfaces

A

b. Address of a single interface

c. Delivery to single interface

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16
Q

What is a multicast address?

a. Address of a set of interfaces
b. Address of a single interface
c. Delivery to single interface
d. Address of a set of interfaces
e. Delivery to all interfaces in the set

A

a. Address of a set of interfaces

e. Delivery to all interfaces in the set

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17
Q

What is an any cast address?

a. Delivery to a single interface in the set
b. Address of a single interface
c. Delivery to single interface
d. Address of a set of interfaces
e. Delivery to all interfaces in the set

A

d. Address of a set of interfaces

a. Delivery to a single interface in the set

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18
Q

What is the range that port numbers can range from?

A

0 - 65,535

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19
Q

What are the well-known ports?

a. 1024-49151
b. 0-1023
c. 49152-65535

A

b. 0-1023

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20
Q

What are the registered ports?

a. 1024-49151
b. 0-1023
c. 49152-65535

A

a. 1024-49151

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21
Q

What are the dynamic ports?

a. 1024-49151
b. 0-1023
c. 49152-65535

A

c. 49152-65535

22
Q

What is the definition of a physical network?

a. Virtual Representation
b. Virtual network of nodes and logical links
c. Visible and physically presented

A

c. Visible and physically presented

23
Q

What is the definition of a logical network?

a. Virtual Representation
b. Virtual network of nodes and logical links
c. Visible and physically presented

A

a. Virtual Representation

24
Q

What is the definition of a overlay network?

a. Virtual Representation
b. Virtual network of nodes and logical links
c. Visible and physically presented

A

b. Virtual network of nodes and logical links

25
Q

Does DHCP run over UDP or TCP?

A

a. UDP

26
Q

What is the linux hostname lookup directory?

A

a. /etc/hosts

27
Q

What is the windows hostname lookup directory?

A

%Systemroot%\System32\Drivers\Etc\hosts

28
Q

What are the three main configuration files when configuring DNS?

a. /etc/bind/named.conf
b. /etc/bind/named.conf.forwarders
c. /etc/bind/named.conf.options
d. /etc/bind/named.conf.local

A

a. /etc/bind/named.conf
b. /etc/bind/named.conf.forwarders
d. /etc/bind/named.conf.local

29
Q

What are the chains under the filter table for iptables?

a. Input, output, prerouting
b. Input, output, forward
c. Input, forward, prerouting
d. prerouting, post routing, output

A

b. Input, output, forward

30
Q

What is the iptables command structure?

A

iptables -t operation chain specs -j target

31
Q

What is the first level of the two-level hierarchy system for internet routing?

A

The first level is autonomous systems (AS’s)

- These are regions of networks under a single administrator domain like Comcast, AT&T, Verizon, etc

32
Q

What do AS’s use for intra-domain routing protocols?

a. Distance Vector (RIP)
b. BGP
c. BGP-4
d. Link State (OSPF)

A

a. Distance Vector (RIP)

d. Link State (OSPF)

33
Q

What do AS’s use for inter-domain routing protocols?

a. Distance Vector (RIP)
b. BGP
c. BGP-4
d. Link State (OSPF)

A

b. BGP

c. BGP-4

34
Q

What is used to determine what a good path is?

A

a. The shortest path
b. Load balanced
c. Lowest cost

35
Q

Which protocol between distance vector and link state will have each network periodically flood the immediate reachability information to all other routers?

A

Link state (OSPF) based on Dijkstra algorithm

36
Q

Internet routing protocols cannot be classified as____

a. Inter and Intra Domain Routing Protocols
b. Breadth First Protocol Depth First Protocol
c. Classful or Classless Protocol
d. Distance Vector Protocol, Link-state Protocol, or Path-vector Protocol

A

b. Breadth First Protocol Depth First Protocol

37
Q

DHCP server will send ____ after the DHCP discover message is received.

a. DHCP Request
b. DHCP Discover
c. DHCP Offer
d. DHCP ACK

A

c. DHCP Offer

38
Q

Address resolution protocol does not consist of information about ____ being used.

a. Receiver Hardware Address (RHA)
b. Sender Network Address (SNA)
c. ARP Protocol Version
d. IP Version Protocol

A

c. ARP Protocol Version

39
Q

For the URL asu.canvas.edu, what is the top domain level?

a. canvas
b. edu
c. ASU

A

b. edu

40
Q

Which firewall table is responsible for translating IP packets?

a. NAT Table
b. Mangle Table
c. Filter Table
d. Raw Table

A

a. NAT Table

41
Q

The _____ option during the NAT procedure is used to perform source network address translation and is applicable to outbound traffic.

a. DNAT
b. SNAT
c. MASQUERADE

A

b. SNAT

42
Q

Which firewall table is responsible for changing packet content?

a. Mangle Table
b. Raw Table
c. Filter Table
d. NAT Table

A

a. Mangle Table

43
Q

What is the equivalent of a postal letter’s “receiver name” in electronic mail?

a. Port Number
b. Host IP Address
c. Network Prefix

A

a. Port Number

44
Q

_______ allows the inside host with a local address to always use an inside global address.

a. Dynamic Address Mapping
b. Static Address Mapping
c. Network Address and Port Translation (NAPT)

A

b. Static Address Mapping

45
Q

In the OSI model, which layer works with MAC addresses?

a. Data Link Layer
b. Transport Layer
c. Network Layer

A

a. Data Link Layer

46
Q

The CIDR concept is designed for IPv4 to _______ .

a. make old classful IP addresses invalid
b. address an IP address shortage issue
c. remove subnet concepts

A

b. address an IP address shortage issue

47
Q

An ip (v6) address has ____bits.

A

128

48
Q

What type of address is used at the end host to identify the application thread that sent and received the packet?

a. Port Number
b. MAC Address
c. IP Address
d. Process ID

A

d. Process ID

49
Q

For the URL www.1.asu.edu, what is top domain level?

a. 1
b. edu
c. ASU
d. www

A

b. edu

50
Q

If we have /16 as our CIDR network mask, how many C subnets we can have?

A

256

51
Q

Which port does the HTTP Server need to use when communicating with an HTTP Client using port 50000?

a. 80
b. 443
c. 22

A

a. 80

CSE 548: Advanced Network Security (2 decks)

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