TCP/IP Model

Question 1

tcp/ip layer

Answer 1

application
transport
internet
network interface

Question 2

osi to tcp/ip model

Answer 2

application, presentation, session –> application
transport –> transport
network –> internet
data link, physical –> network interface

Question 3

network interface

Answer 3

transmit bits across network

ethernet, token ring, fddi, rs-232

Question 4

internet

Answer 4

packages data into ip datagrams and routes externally

ip, icmp, arp, rarp

Question 5

transport

Answer 5

communication and session management

tcp, udp, rtp

Question 6

application

Answer 6

how programs interface with transport
user interaction
http, telnet, ftp, snmp, dns, smtp, ssl, tls

Question 7

ports

Answer 7

0 to 65,535

Question 8

well known and reserved ports

Answer 8

0 to 1023

Question 9

ephemeral ports

Answer 9

short-lived transport

1024 to 65,535

Question 10

overhead of tcp and udp

Answer 10

tcp header 20 bytes

udp header 8 bytes

Question 11

ipv4 packets

Answer 11

src addr
dest addr
ip flags
protocol (tcp/udp)

Question 12

ftp

Answer 12

file transfer protocol
ports 20,21
transfer files, unsecure

Question 13

ssh

Answer 13

secure shell
port 22
remote login to computer systems

Question 14

sftp

Answer 14

ssh file transfer protocol
port 22
file access, file transfer, file management, secure

Question 15

telnet

Answer 15

port 23

insecure ssh, dont use

Question 16

smtp

Answer 16

simple mail transfer protocol
port 25
internet standard for sending electronic mail

Question 17

dns

Answer 17

domain name system
port 53
domain names to ips

Question 18

dhcp

Answer 18

dynamic host configuration protocol
ports 67,68
assign ip, subnet mask, default gateway and dns server dynamically

Question 19

tftp

Answer 19

trivial file transfer protocol
port 69
booting an OS from LAN file server
stripped down ftp

Question 20

http

Answer 20

hyper text transfer protocol

port 80

Question 21

pop3

Answer 21

post office protocol v3
port 110
retrieve email from remote server

Question 22

ntp

Answer 22

network time protocol
port 123
clock sync

Question 23

netbios

Answer 23

port 139

allows communication over windows lan for file and printer sharing

Question 24

imap

Answer 24

internet mail application
port 143
pop3+: end user can manipulate the messages as if they were stored locally

Question 25

snmp

Answer 25

simple network management protocol
ports 161, 162
collect data about network devices and monitor their status

Question 26

ldap

Answer 26

lightweight directory access protocol
port 389
vendor neutral directory access like active directory

Question 27

https

Answer 27

hypertext transfer protocol secure

port 443

Question 28

smb

Answer 28

server message block
port 445
windows file/printer sharing

Question 29

syslog

Answer 29

system logging protocol
port 514
send logging data back to central server

Question 30

smtp tls

Answer 30

simple mail transfer protocol transport layer security
port 587
secure and encrypted way to send emails

Question 31

ldaps

Answer 31

lightweight directory access protocol secure

port 636

Question 32

imap over ssl

Answer 32

internet message access protocol over secure socket layer
port 993
secure and encrypted way to receive emails

Question 33

pop3 over ssl

Answer 33

post office protocol version 3 over secure socket layer
port 995
secure pop3

Question 34

sql protocol

Answer 34

port 1433

client to database communication

Question 35

sqlnet protocol

Answer 35

port 1521

client to oracle database communication

Question 36

mysql protocol

Answer 36

port 3306

client to mysql database communication

Question 37

rdp

Answer 37

remote desktop protocol
port 3389
windows gui for remote access

Question 38

sip

Answer 38

session initiation protocol
ports 5060, 5061
initialize voip and video calls

Question 39

gre

Answer 39

generic routing encapsulation protocol
simple way to create tunnel over public network
check MTU, no encryption

Question 40

ipsec

Answer 40

internet protocol security protocol
set of secure communication protocols, protect data flows between peers over public wan
used in vpns
ah, esp

Question 41

ah

Answer 41

authentication header
in ipsec
provides integrity and authentication

Question 42

esp

Answer 42

encapsulating security payload
for data packets with ipsec
provides integrity and authentication