Chapter 3 (Part 2)

Question 1

OSI 7 Layers

Answer 1

7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data Layer
1 Physical

Question 2

What are the 4 TCP/IP Layers

Answer 2

Application
Transport
Internet
Link

Question 3

On TCP /IP Mention 3 Protocols on Application Layer

Answer 3

HTTP
FTP
SMTP
DNS
RIP
SNMP

Question 4

What are the TCP/IP Transport Protocols

Answer 4

TCP / UDP

Question 5

What are the 4 Internet Protocols

Answer 5

IPSEC
IP
ARP
ICMP

Question 6

What are the 4 Network Interface Protocols

Answer 6

Ethernet
Token Ring
Frame Relay
ATM

Question 7

Describe TCP Protocol Layer

Answer 7

Connection-oriented
Virtual circuit established via three-way handshake
Header composition – Flag field

Question 8

User Datagram Protocol UDP

Answer 8

Connectionless

Simple Header composition

Question 9

Describe Internet Protocol IP

Answer 9

• Unreliable Connectionless datagram protocol
  . Does not Guarantee Delivery
• Provides Route addressing for data packets

Question 10

Internet Group Management Protocol IGMP

Answer 10

Allows system to support multicasting

Question 11

What does the Internet Control Messaging Protocol (ICMP) is used for

Answer 11

Used to determine the health of a network.
tools like: ping, traceroute

0 Echo Reply
3 Destination Unreachable
5 Redirect
8 Echo Request
9 Router Advertisement
10 Routes Solicitation
11 Time Exceeded

Question 12

What does DNS do?

Answer 12

Solves Human Readable domain name for the IP

Question 13

What does ARP do?

Answer 13

Resolves IP address in its MAC Equivalent

Question 14

DMZ

Answer 14

open subnet offering resources to public

Question 15

Describe Firewall and its types

Answer 15

Prevent malicious traffic to entering the network

Static’s packet filtering operates at layer 3

Stateful Inspection operates at layer 3 and 4

Circuit Level Gateway operates at layer 5

Application Gateway operates at layer 7