Day 31

Question 1

Describe OSI vs TCP/IP Model

Answer 1

OSI - 7 Layers

TCI/IP - 4 (Network, Internet, Transport, Application)

Question 2

OSI L7

Answer 2

Application

Refers to the interfaces between network and application software. Also includes authentication services .

Question 3

Which layer includes authentication?

Answer 3

L7 - Application

Question 4

OSI L6

Answer 4

Presentation

Defines the format and organization of data. Includes ENC

Question 5

Which layer includes encryption?

Answer 5

L6 - Presentation

Question 6

OSI L5

Answer 6

Session

Establishes and maintains end-to-end bidirectional flows between endpoints.

Includes Managing transaction flows

Question 7

OSI L4

Answer 7

Transport

Host-to-Host Communications, including connection establishment and termination, flow control, error recovery, and segmentation of large data.

Question 8

OSI L3

Answer 8

Network

Logical Addressing, routing, and path determination

Question 9

OSI L2

Answer 9

Data Link

Formats data into frames appropriate for transmission onto some physical medium.

Question 10

OSI L1

Answer 10

Physical

Defines the electrical, optical, cabling required for transmitting bits.

Question 11

TCP/IP Layer 4

Answer 11

Application

Question 12

TCP/IP Layer 3

Answer 12

Transport

Question 13

TCP/IP Layer 2

Answer 13

Internet

Question 14

TCP/IP Layer 1

Answer 14

Network Access

Question 15

TCP/IP Application Layer Protocols

Answer 15

DNS, Telnet, SMTP, POP3, IMAP, DHCP, HTTP, FTP, SNMP

Question 16

TCP/IP Transport Layer Protocols

Answer 16

TCP/UDP

Question 17

TCP/IP Internet Layer Protocols

Answer 17

IP, ARP, ICMP

Question 18

DNS

Answer 18

Domain Name System

Provides the IP address of a website or domain name.

Port 53

Question 19

Telnet

Answer 19

Enables admin to log in to a host from a remote location.

Port 23

Question 20

SMTP

Answer 20

Simple Mail Transfer Protocol

Sending of email.

Port 25

Question 21

POP3

Answer 21

Post Office Protocol

Sending of email.

Port 110

Question 22

IMAP

Answer 22

Internet Message Access Protocol

Sending of email

Question 23

DHCP

Answer 23

Dynamic Host Configuration Protocol

Assigns IP addressing to clients

Port 67, 68

Question 24

HTTP

Answer 24

Transfers data between web clients

Port 80

Question 25

FTP

Answer 25

File Transfer Protocol Facilitates the download and upload of files between FTP client and FTP Server Port 20, 21

Question 26

SNMP

Answer 26

Simple Network Messaging Protocol Enables Network management systems to monitor devices attached to the network. Port 161

Question 27

TCP

Answer 27

Supports virtual connections between hosts on the network.

Question 28

UDP

Answer 28

Connectionless

Question 29

ARP

Answer 29

Address Resolution Protocol Finds a host's hardware address when only the IP address is known.

Question 30

ICMP

Answer 30

Internet Control Message Protocol Sends error and control messages.

Question 31

OSI L7 PDU

Answer 31

Data

Question 32

OSI L6 PDU

Answer 32

Data

Question 33

OSI L5 PDU

Answer 33

Data

Question 34

OSI L4 PDU

Answer 34

Segment

Question 35

OSI L3 PDU

Answer 35

Packet

Question 36

OSI L2 PDU

Answer 36

Frame

Question 37

OSI L1 PDU

Answer 37

Bits