Domain 4 - Communication and Network Security

Question 1

Seven layer model defined in 1984 and published as an international standard, ISO/IEC 7498-1

Answer 1

(OSI) Open System Interconnect Model

Question 2

Used by protocols to add a header (and maybe a footer) to data received by each layer above before handing over to next layer down.

The cumulative data + header becomes the payload handed to next layer as data moves down the model from layer 7 to layer 1

Answer 2

Encapsulation

Question 3

What is Layer 7 of OSI Model?

Answer 3

Application

Question 4

What is Layer 6 of OSI Model?

Answer 4

Presentation

Question 5

What is Layer 5 of OSI Model?

Answer 5

Session

Question 6

What is Layer4 of OSI Model?

Answer 6

Transport

Question 7

What is Layer 3 of OSI Model?

Answer 7

Network

Question 8

What is Layer 2 of OSI Model?

Answer 8

Data Link

Question 9

What is Layer 1 of OSI Model?

Answer 9

Physical

Question 10

What are the two SUB LAYERS of layer 2 of the OSI model?

Answer 10

Logical Link Control (LLC)

and

Media Access Control (MAC)

Question 11

What is layer 4 of the TCP/IP model?

Answer 11

Application

Question 12

What is layer 3 of the TCP/IP model?

Answer 12

Transport

Question 13

What is layer 2 of the TCP/IP model?

Answer 13

Network

Question 14

What is layer 1 of the TCP/IP model?

Answer 14

Link Layer

Question 15

What protocols exist at lay 4 of TCP/IP model?

Answer 15

FTP
Telnet
SNMP
LPD
TFTP
SMTP
NFS
X-Windows

Question 16

What protocols exist at lay 3 of TCP/IP model?

Answer 16

TCP

UDP

Question 17

What protocols exist at lay 2 of TCP/IP model?

Answer 17

ICMP
IGMP
IP

Question 18

What protocols exist at lay 1 of TCP/IP model?

Answer 18

Link
Ethernet
Fast Ethernet
Token Ring
FDDI

Question 19

What protocols exist at lay 7 of OSI model?

Answer 19

FTP
Telnet
SNMP
LPD
TFTP
SMTP
NFS
X-Windows

Question 20

What protocols exist at lay 6 of OSI model?

Answer 20

FTP
Telnet
SNMP
LPD
TFTP
SMTP
NFS
X-Windows

Question 21

What protocols exist at lay 5 of OSI model?

Answer 21

FTP
Telnet
SNMP
LPD
TFTP
SMTP
NFS
X-Windows

Question 22

What protocols exist at lay 4 of OSI model?

Answer 22

TCP

UDP

Question 23

What protocols exist at lay 3 of OSI model?

Answer 23

ICMP
IGMP
IP

Question 24

What protocols exist at lay 2 of OSI model?

Answer 24

Link
Ethernet
Fast Ethernet
Token Ring
FDDI

Question 25

What protocols exist at lay 1 of OSI model?

Answer 25

``` Link Ethernet Fast Ethernet Token Ring FDDI ```

Question 26

Simplex is ___________

Answer 26

One way Communication

Question 27

Half-Duplex is ___________

Answer 27

Two way communication, but only one at a time

Question 28

Full-Duplex is ___________

Answer 28

Two way simultaneous communication

Question 29

What are the WELL KNOWN port ranges?

Answer 29

0 - 1023

Question 30

What are the REGISTERED port ranges?

Answer 30

1024 - 49,151

Question 31

What are the DYNAMIC (ephmeral) port ranges?

Answer 31

49,152 - 65,535

Question 32

What type of hardware are you likely to see at Layer 3?

Answer 32

Routers - using destination IP to guide transmission Bridge Routers (brouters) - route first then bridge if fail (combo or bridge and router)

Question 33

IEEE 802.3 =

Answer 33

Ethernet

Question 34

IEEE 802.5 =

Answer 34

Token Ring

Question 35

What type of hardware are you likely to see at Layer 2?

Answer 35

Bridges Switches

Question 36

EUI-48 and EUI-64 is intended to replace what?

Answer 36

MAC addresses

Question 37

What would be the first AND last usable IPv4 address?

Answer 37

1.0.0.1 and 254.255.255.254

Question 38

IP Address range for first octet: Class A is what?

Answer 38

1 - 126 Loopback address: 127.0.0.1

Question 39

IP Address range for first octet: Class B is what?

Answer 39

128 - 191

Question 40

IP Address range for first octet: Class C is what?

Answer 40

192 - 223

Question 41

IP Address range for first octet: Class D is what?

Answer 41

224 - 239

Question 42

IP Address range for first octet: Class E is what?

Answer 42

240 - 254

Question 43

PRIVATE IP Address Ranges: Class A is what?

Answer 43

10.0.0.0

Question 44

PRIVATE IP Address Ranges: Class B is what?

Answer 44

172.16 - 172.31

Question 45

PRIVATE IP Address Ranges: Class C is what?

Answer 45

192.168.0

Question 46

Default subnet masks for CLASS A network

Answer 46

255.0.0.0 CIDR = /8

Question 47

Default subnet masks for CLASS B network

Answer 47

255.255.0.0 CIDR = /16

Question 48

Default subnet masks for CLASS C network

Answer 48

255.255.255.0 CIDR = /24