Cissp Telecommunications Part 2

Front 1

What are some of the feature sets of the physical layer?

Back 1

Converts bits into electrical signals and controls physical aspects of data

Front 2

What are some of the standards interfaces at this layer?

Back 2

HSSI, X.21, EIA/TIA-232 and EIA/TIA-449

Front 3

TCP is a (blank) oriented protocol.

Back 3

connection

Front 4

IP is a (blank) protocl

Back 4

connectionless

Front 5

UDP is a (blank) protocol

Back 5

connectionless

Front 6

What layer does a repeater operate at?

Back 6

Physical Layer

Front 7

What does a repeater do?

Back 7

Amplifies signal and extends networks

Front 8

What network layer does a Bridge operate at?

Back 8

Data Link Layer

Front 9

What does a bridge do?

Back 9

Forwards packets and filters based on MAC addresses; forwards broadcast traffic, but not collison traffic

Front 10

What OSI network layer does a Router exist?

Back 10

Network

Front 11

What does a router do?

Back 11

Separates and connects LANs creating internetworks; routers fileter based on IP addresses

Front 12

What OSI network layer does a Brouter exist at?

Back 12

Data and Network Layers

Front 13

What does a Brouter do?

Back 13

A hybrid device that combines the fucntionality of a bridge and a router

Front 14

What OSI network layer does a switch operate at?

Back 14

Data link layer

Front 15

What does a swich do?

Back 15

Provides a virtual link between communicating devices, allows for VLANs, reduces traffic, and impedes network sniffing

Front 16

What OSI layer does the Gateway exist at?

Back 16

The Application layer

Front 17

What does a Gateway do?

Back 17

Connects different types of networks, performs protocol and format translations

Front 18

What OSI layer does Frame Relay operate at?

Back 18

Data Link Layer

Front 19

Dedicated Lines are...

Back 19

1. Dedicated leased line that connects two locations
2. Releatively expensive
3. Secure as both location are using same media

Front 20

Frame Relay is...

Back 20

1. Uses SVCs and PVCs
2. Fee based on bandwidth
3. Shared media between computers
4. WAN protocol that uses packet-switching over public networks

Front 21

X.25 is...

Back 21

1. Shared media between companies
2. slower than frame because of high overhead
3. International Standard
4. 1st packet switched network developed to work over public networks

Front 22

SMDS...

Back 22

1. High-speed switching technology to be used over public network

Front 23

ATM...

Back 23

1. high bandwidth switching and multiplexing technology - low delay
2. 53 byte fixed cells
3. Uses PVC and SVC
4. Very fast becuase of low overhead

Front 24

SDLC...

Back 24

1. enables mainframes to communicate
2. uses polling to allow primary and secondary stations to communicate

Front 25

HDLC...

Back 25

1. PTP and multipoint communication
2. data encapsulation for synchronus serial links

Front 26

HSSI...

Back 26

1. DTE/DCE interface to enable high speed communication over WAN links

Front 27

VOiP

Back 27

1. Combines voice and data over the same network media and protocol
2. Reduces cost of implementing and maintaining two different networks

Front 28

ISDN/BRI =

Back 28

2 "channels" and one "D" channel. Combined bandwidth 144 kbps

Front 29

ISDN/PRI =

Back 29

up to 23 B channels and 1 D channel at 64 kbps. Total bandwidth is 1.544 Mps/T1

Front 30

ISDN/Broadband =

Back 30

usually implented with telco carrier backbones. When BISDN is used ATM is used to encapsulate data at the data link layer into cells and these cells travel over a SONET network

Front 31

PPTP is...

Back 31

1. Encapsulation based on PPP
2. Data Link Layer
3. Single PTP communications
4. Client Server technology

Front 32

L2F is...

Back 32

1. Cisco proprietary
2. no encryption
3. mutual authentication

Front 33

L2TP is...

Back 33

1. Hybrid of L2F and PPTP
2. Data Link Layer
3. work on multiple networks not just IP
4. Combines with IPSec for security

Front 34

IPSec is...

Back 34

1. Supports only IP
2. Focuses on LAN to LAN
3. Works on Network Layer and provides security on top of IP
4. can work in tunnel or transport mode(s)

Front 35

PPP is...

Back 35

1. encapsulate through a IP Network over a serial line
2. Supports CHAP, EAP, and PAP
3.

Front 36

PAP is...

Back 36

1. least secure of CHAP and EAP
2. In cleartext
3. replay attacks
4. Password and username are the credentials that are sent to an authentication server after establised via PPP

Front 37

CHAP is...

Back 37

1. Uses challenge/response
2. challenge is a random value
3. Plaintext = sniffing. no man in the middle or replay attacks