Domain 4: Communications Network Security

Question 1

To secure a network architecture you must understand:

Answer 1

1. Various networking platforms involved
2. Network devices
3. How data flows through a network
4. Understand various protocols
5. Protocol purposes, their interactions with other protocols
6. How protocol may be exploitable or its vulnerabilities
7. Understand how to implement appropriate protocols in a given environment
8. Different devices, protocols, and security mechanisms within an environment provide different functionality
9. Provide a layered approach to security
10. Layers are important, if an attacker penetrates one layer, another layer
    protects internal network

Question 2

OSI Model Layer List

Answer 2

*Layer Seven – Application Layer
*Layer Six - Presentation Layer
*Layer Five – Session Layer
*Layer Four – Transport Layer
*Layer Three – Network Layer
*Layer Two – Data-Link Layer
*Layer One – Physical Layer

Question 3

Types of Data Transmission

Answer 3

*Asynchronous Data Transmission
*Synchronous Data Transmission

Question 4

Define Baseband and Broadband

Answer 4

1. Baseband uses the entire communication channel for its transmission
2. Broadband divides the communication channel into individual and independent channels so different types of data can be transmitted simultaneously

Question 5

Types of cabel

Answer 5

*Coaxial Cable
*Twisted-Pair Cable
*Twisted-Pair Cable
*Fiber-Optic Cable

Question 6

Types of Spread spectrum in wireless communication

Answer 6

1. Frequency hopping spread spectrum (FHSS)
2. Direct sequence spread spectrum (DSSS)

Question 7

What are the main reasons for creating a network?

Answer 7

1. To allow communication between computers
2. To share information
3. To share resources
4. To provide central administration

Question 8

Types of network topology:

Answer 8

*Ring Topology
*Bus Topology
*Star Topology
*Mesh Topology

Question 9

Types of routing Protocol

Answer 9

Routing Information Protocol (RIP)
Open Shortest Path FIrst (OSPF)
Interior Gateway Routing Protocol
(IGRP)
Enhanced Interior Gateway Routing Protocol (EIGRP)

Question 10

Types of Collision Detection/Avoidance

Answer 10

1. Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
2. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)

Question 11

ARP

Answer 11

Address Resolution Protocol (ARP) is a protocol that maps dynamic IP addresses to permanent physical machine addresses in a local area network (LAN).

Question 12

What is 3-way handshake?

Answer 12

A three-way handshake is also known as a TCP handshake or SYN-SYN-ACK, and requires both the client and server to exchange SYN (synchronization) and ACK (acknowledgment) packets before actual data communication begins.