OSI / TCP/IP

Question 1

OSI Layers

Answer 1

Application
Presentation 
Session
Transport
Network
Data Link
Physical

Question 2

TCP/IP Layers

Answer 2

Application (7-5)
Transport (4)
Internet (3)
Link (2-1)

Question 3

Application Protocols

Answer 3

DNS
DHCP
LDAP
HTTP
FTP
TFTP
SNMP
SMTP
POP3
IMAP4
SMB

Question 4

Transport Protocols

Answer 4

TCP

UDP

Question 5

Network Protocols

Answer 5

IP4
IP6
ARP
IGMP
ICMP
IPSec
RIP
OSPF

Question 6

Data Link Protocols

Answer 6

Token Ring
Frame Relay
ATM

Question 7

Physical Protocols

Answer 7

Ethernet

Question 8

TCP Handshake process

Answer 8

Synchronize (SYN) and Acknowledge (ACK)

SYN
SYN/ACK
ACK
Data Transmission

Question 9

TCP Sliding Window

Answer 9

Specifies number of segments sent between acknowledgments.

Question 10

What two parameters are negotiated between sending and receiving computers after a TCP session is initiated?

Answer 10

Segment size and sliding window.

Question 11

NACK indicates

Answer 11

Negative Acknowledge

TCP segments missing or corrupted

Question 12

SSL provides security in what areas

Answer 12

Confidentiality

Integrity

Authentication

Question 13

SSL uses what for authentication

Answer 13

Digital certificates

Question 14

IPSec uses what for authentication

Answer 14

Authentication Header (AH)

Question 15

IPSec uses what for encryption

Answer 15

Encapsulating Security Protocol (ESP)

Question 16

IPSec Tunnel mode…

Answer 16

Encrypts entire packet (data and headers) and encapsulates encrypted packet inside another packet and sends.

(VPN)

Question 17

IPSec Transport mode…

Answer 17

Encrypts data only, leaving headers intact and sends packet

Used within internal networks

Question 18

What does L2TP use for encryption

Answer 18

IPSec

Question 19

Class A IP range

Answer 19

1-126

Question 20

Class B IP range

Answer 20

128-191

Question 21

Class C IP range

Answer 21

192-223

Question 22

Reserved Private IP ranges (Class A)

Answer 22

10.0.0.0 - 10.255.255.255

Question 23

Reserved Private IP ranges (Class B)

Answer 23

172.16.0.0 - 172.31.255.255

Question 24

Reserved Private IP ranges (Class C)

Answer 24

192.168.1.0 - 192.168.255.255