Networking :3

Question 1

TCP Three-Way Handshake explanation

Answer 1

Establishes that destination device is present on network
Verifies the destination device has an active service and is accepting requests on the destination port number
Informs destination device that source client intends to establish a communication session on that port number.

Question 2

Definition of 3 way handshake

Answer 2

establishes a connection between a client and server

Question 3

DHCP

Answer 3

Dynamic Host Configuration Protocol
Automatically assigns IP addresses

Question 4

DHCP ATTACKS >:(

Answer 4

DHCP SPOOFING
DHCP Starvation :o

Question 5

TCP

Answer 5

Transmission Control Protocol
Reliable, connection-oriented transport layer protocol.

Question 6

UDP

Answer 6

User Datagram Protocol
Unreliable, connectionless transport layer protocol.

Question 7

POP :o

Answer 7

Post Office Protocol
Protocol for receiving emails
(TCP)

Question 8

IMAP

Answer 8

Internet Message Access Protocol
Protocol for accessing and managing emails on a server
(TCP)

Question 9

FTP

Answer 9

File Transfer Protocol
Protocol for transferring files
(TCP)

Question 10

TFTP

Answer 10

Trivial File Transfer Protocol
Simplified FTP without authentication
(UDP)

Question 11

HTTP

Answer 11

HyperText Transfer Protocol
Protocol for web browsing
(TCP) :3

Question 12

HTTPS

Answer 12

HyperText Transfer Protocol
Secure version of HTTP using SSL/TLS
(TCP, UDP)

Question 13

DNS

Answer 13

Domain Name System
Resolves domain names to IP addresses
(TCP, UCP)

Question 14

SMTP

Answer 14

Simple Mail Transport Protocol
Protocol for sending emails
(TCP)

Question 15

Broadcast Domain

Answer 15

Devices use broadcasts in an ethernet LAN to locate: other devices like ARP, services like DHCP

Question 16

Collision Domain

Answer 16

A network segment where network devices contend for access to communication medium and collisions can occur.

Question 17

Telnet

Answer 17

Teletype Network
provides access to virtual terminals of remote systems on local area networks or the Internet
Telnet transfers the data in plain text

Question 18

SSH

Answer 18

Secure Shell
Secure remote login protocol
Transfers data that is encrypted

Question 19

Firewall Techniques

Answer 19

Packet Filtering, application filtering, URL filtering, Stateful Packet Inspection (SPI)

Question 20

Packet Filtering

Answer 20

Prevents/allows access based on IP or MAC addresses

Question 21

Application Filtering

Answer 21

Prevents/allows by specific application types based on port numbers

Question 22

URL Filtering

Answer 22

Prevents/allows access to websites based on specific URLs or keywords

Question 23

SPI

Answer 23

Stateful Packet Inspection
Incoming packets must be legitimate responses to requests from external hosts

Question 24

Viruses

Answer 24

copies itself and spreads by attaching to other files or programs

Question 25

WORMS!

Answer 25

Don't need a host, self-replicates, spreads across networks and systems independently

Question 26

Trojan Horse (neigh)

Answer 26

Disguises itself tricking users into executing it. Usually create a backdoor

Question 27

Switch Forwarding Method?

Answer 27

Cut-through Switching Switch buffers just enough of the frame to read destination MAC addresses so it can determine to which port to forward the data Two variants: Fast-Forward Fragment-Free

Question 28

ARP :o

Answer 28

Address Resolution Protocol Maps IP addresses to MAC addresses -device will search its ARP table/ARP cache to find IPv4 address and its corresponding MAC address If on different device search ARP table for IPv4 address of default gateway

Question 29

ARP performance issue

Answer 29

excessive broadcasts can lead to network congestion

Question 30

ARP security issue

Answer 30

ARP Spoofing: send false ARP messages

Question 31

Transport Layer

Answer 31

Responsible for establishing a temporary communication session between 2 applications and delivering data between them PDU: Segment Addressing Type: Port Numbers Protocol: TCP, UDP

Question 32

Network Layer

Answer 32

Responsible for logical addressing, routing and forwarding PDU: Packet Addressing Type: IP addresses Protocol: IPV4, IPV6

Question 33

Data Link Layer

Answer 33

Handles physical addressing, framing, error detection PDU: Frame Addressing Type: MAC address Protocol: Ethernet

Question 34

Application Layer

Answer 34

Used to exchange data between programs running on the source and destination hosts PDU: Data Protocol: DHCP, DNS,

Question 35

Physical Layer

Answer 35

Provides the means to transport the bits that make up a data link layer frame across the network media PDU: Bits Protocol: uh :3

Question 36

Types of threats

Answer 36

Info theft Data loss and manipulation Identity theft Disruption of service

Question 37

Bandwidth

Answer 37

Capacity of a medium to carry data

Question 38

throughput

Answer 38

measure of the transfer of bits across the media over a period of time

Question 39

Encapsulation :>

Answer 39

Data is divided into segments TCP segment is encapsulated in IP Packet IP Packet is encapsulated in Ethernet Frame

Question 40

NEVER BACK DOWN NEVER WHAT?

Answer 40

NEVER GIVE UP! :-)