Telecommunications And Network Security

Front 1

What is the OSI Seven Layer Model

Back 1

allows dissimilar networks to communicate with each other

Front 2

List from transmit order the seven layers of OSI

Back 2

Application
Presentation
Session
Transport
Network
Data Link
Physical

Front 3

What are some of the functions and protocols in the OSI Model - Application Layer

Back 3

1) handles file transfers, virtual terminals, network management
2) FTP, TFPT, SNMP, SMTP, HTTP

Front 4

What are some of the functions and protocols in the OSI Model - Presentation Layer

Back 4

1) translates packages into standard formats, data compression/decompression, data encryption and decryption.
2) Standards, not protocols used at this layer - ASCII, TIFF, JPEG, MPEG

Front 5

What are some of the functions and protocols in the OSI Model - Session Layer

Back 5

1) responsible for session maintenance, sets up connections between apps, maintains dialog control.
2) NFS, NetBIOS, SQL,
RPC

Front 6

What are some of the functions and protocols in the OSI Model - Transport Layer

Back 6

1) handles end to end transmission and segmentation into a data stream
2) TCP, UDP, SSL, SPX

Front 7

What are some of the functions and protocols in the OSI Model - Network Layer

Back 7

1) addressing and routing of packets
2) RIP, OSPF, IP, IPX

Front 8

What are some of the functions and protocols in the OSI Model - Data Link Layer

Back 8

1) converts data into frames for transmission, converts message into bits
2) this layer is divided into LLC and MAC
3) SLIP, ARP, RARP, PPP

Front 9

What are some of the functions and protocols in the OSI Model - Physical
Layer

Back 9

1) converts bits into electrical signals, controls physical aspects of data transmission
2) HSSI, EIA/TIA-232, EIA/TIA-449

Front 10

Within the Data Link Layer, what is the purpose of the sub-layers LLC

Back 10

Logical Link Control (LLC)
1) Logical link control refers to the functions required for the establishment and control of logical links between local devices on a network

Front 11

What is the purpose of the Data Link Sublayer - MAC

Back 11

Media Access Control (MAC): 1) This refers to the procedures used by devices to control access to the network medium.
2) Since many networks use a shared medium (such as a single network cable, or a series of cables that are electrically connected into a single virtual medium) it is necessary to have rules for managing the medium to avoid conflicts. For example. Ethernet uses the CSMA/CD method of media access control, while Token Ring uses token passing.

Front 12

What is the overall purpose of the Data Link Layer.

List three items and explain

Back 12

1) Data Framing: The data link layer is responsible for the final encapsulation of higher-level messages into frames that are sent over the network at the physical layer.
2) Addressing: The data link layer is the lowest layer in the OSI model that is concerned with addressing: labeling information with a particular destination location. Each device on a network has a unique number, usually called a hardware address or MAC address, that is used by the data link layer protocol to ensure that data intended for a specific machine gets to it properly.
3.) Error Detection and Handling: The data link layer handles errors that occur at the lower levels of the network stack. For example, a cyclic redundancy check (CRC) field is often employed to allow the station receiving data to detect if it was received correctly.

Front 13

Compare and Contrast

TCP and UPD

Back 13

TCP - connection based
UDP - connectionless oriented
TCP - handsshake set up before communication begins via virtual circuit
UDP - no hnadshake, no virtual connection
TCP - reliable, ensures delivery of packets
UDP - best effort, does not send acknowledgement of packet receipt
TCP - packets contain more information, thus more overhead and slower
UDP - uses less resources and thus faster than TCP

Front 14

Compare and Contrast
IP Addressing

IP V4 and IP V6

Back 14

IP V4 - 32 bit (4-byte) addresses
IP-V6 - 128 bit (16-byte)
IP V4 - 4,294,967,296 possible ip addressess
IP V6 - more possible public addressess available than IP V4

Front 15

IP V4 has what two types of addressess

Back 15

Network address

Host address

Front 16

Definition of LAN

Back 16

A LAN connects network devices over a relatively short distance. A networked office building, school, or home usually contains a single LAN, though sometimes one building will contain a few small LANs (perhaps one per room), and occasionally a LAN will span a group of nearby buildings. In TCP/IP networking, a LAN is often but not always implemented as a single IP subnet.

Front 17

Definition of WAN

Back 17

A WAN is a geographically-dispersed collection of LANs. A network device called a router connects LANs to a WAN. In IP networking, the router maintains both a LAN address and a WAN address.

Front 18

What are differences between a LAN and a WAN

Back 18

A WAN differs from a LAN in several important ways. Most WANs (like the Internet) are not owned by any one organization but rather exist under collective or distributed ownership and management. WANs tend to use technology like ATM, Frame Relay and X.25 for connectivity over the longer distances.

Front 19

Definition of MAN

Back 19

Metropolitan Area Network - a network spanning a physical area larger than a LAN but smaller than a WAN, such as a city. A MAN is typically owned an operated by a single entity such as a government body or large corporation.

Front 20

Definition of Campus Area Network

Back 20

Campus Area Network - a network spanning multiple LANs but smaller than a MAN, such as on a university or local business campus.

Front 21

Definition of SAN

Back 21

connects servers to data storage devices through a technology like Fibre Channel.

Front 22

Definition of Fibre Channel

Back 22

a set of related physical layer networking standards. Fibre Channel technology handles high-performance disk storage for applications on many corporate networks. Fibre Channel supports data backups, clustering and replication.