Term
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Definition
Open Systems Interconnection.
The Layers
Application - 7
Presentation - 6
Session - 5
Transport - 4
Network - 3
Data-Link - 2
Physical - 1
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Term
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Definition
Layer 7: Provides services and utilities and utilities that enables application programs to access the network and it's resources.
(HTTP, DNS, FTP, Gopher, NFS, NTP, SMTP, SNMP, Telnet) |
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Definition
Layer 6: Encoding data into a standard network-compatible format. Performs Encryption, Decryption, Compression, Encoding, and Formatting.
(MME, SSL, TLS, GIF, JPEG, TIFF) |
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Definition
| Layer 5: Establishes a connection between network devices and applications, maintaining the connection, and then termination or restarting it when necessary. |
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Definition
Layer 4: Breaks data from upper layer into segments. It then passes the segments to lower layers and ensures that all pieces arrive correctly at the other end. (If TCP) This layer also carries out error correction and sending acknowledgements at the network level.
(TCP, UDP, IPsec)
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Term
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Definition
Layer 3: IP packet added to Segment. Can now travel across routers, since it's Layer 3. Routers operate here.
(IP, ARP, IMCP, DHCP, RIP, OPSF, BGP, IGMP) |
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Term
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Definition
Layer 2: Packet recieves frame. Gets source and destination MAC addresses added. Transfers Data Packets between adjacent network nodes. Groups data bits into frames and attaches the address of the recieving node to each frame. Switches and bridges operate on this layer.
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Definition
| Layer 1: Provides the means of transmitted data bits over a physical medium. Sends and recieves bits. |
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Definition
| Sub-Layer (2): Responsible for identifying Network layer protocols and encapsulating those protocols so that multiple upper-layer protocols can share the same media. |
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Term
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Definition
| Layer 2: LAN technology that uses Ethernet NICs and twisted pair coax or fiber media. |
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Term
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Definition
| Uses switches to allow for Full-Duplexing/Use of full bandwidth. |
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Term
| Ethernet Frame Fields: Preamble &^ SFD (Start of Frame Delimiter) |
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Definition
A pattern of ones and zeros used to signal the start of the frame and provide synchronization timing. The preabmle notifies all node that there is data to follow. 7 bytes in size.
SFD- Start of frame. 1 byte - Signifies when the data starts. |
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Term
| Ethernet Frame Fields: Destination Address |
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Definition
| The address to which the frame is being sent; it can be unicast, multicast, or broadcast address. It is 6 bytes in size. |
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Term
| Ethernet Frame Fields: Source Address |
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Definition
| The address of the node sending - the frame is always a unicast address. The source address is ALWAYS a unicast. 6 bytes in size. |
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Term
| Ethernet Frame Fields: Frame Type |
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Definition
| The frame typr tells which upper-layer protocol should recieve the data after ethernet processes it. 2 bytes in size. |
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Term
| Ethernet Frame Fields: The Data |
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Definition
| The payload of the frame (or the information being sent). It must be at least 46 bytes big and can be maximum of 1500 bytes. |
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Term
| Ethernet Frame Field: FCS/CRC |
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Definition
| A 4-byte word generated by the sending node, enablign the receiving node to check the quality of the data it received. |
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Term
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Definition
| Family of networking standards developed by the IEEE in 1980 to address the rapid changes in networking technology. |
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Term
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Definition
| Original Implementation developed by Xerox, and adopted by IEEE. this standard specifie: media type, speed, and signal method. |
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Definition
| Developed to address the need for MAC-sub-layer addressing in bridges. Specifies frame size and rate. |
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Term
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Definition
Specification: 802.3a
Medium: Thinnet Coax
Distance: 185 meters |
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Term
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Definition
Specification: 802.3
Medium: Thicknet Coax
Distance: 500 meters
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Term
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Definition
Specification: 802.3i
Medium: CAT5 UTP
Distance: 100 meters |
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Term
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Definition
Specification: 802.3j
Medium: Fiber
Distance: 2000 meters |
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Term
| 10Base Codes: FB (Fiber Backbone) |
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Definition
Specification: 802.3j
Medium: Fiber
Distance: 2000 Meters |
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Term
| 10Base Codes: FL (Fiber Link) |
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Definition
Specification: 802.3j
Medium: Fiber
Distance: 2000 meters
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Term
| 10Base Codes: FP (Fiber Passive) |
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Definition
Specification: 802.3j
Medium: Fiber
Distance: 500 meters |
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Term
| Fast Ethernet Standards: 100Base-T |
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Definition
Specification: 802.3u
Medium: CAT5 UTP
Distance: 100 Meters
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Term
| Fast Ethernet Standards: 100Base-T4 |
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Definition
Specification: 802.3u
Mediums: CAT 3, 4, or 5 UTP
Distance: 100 meters |
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Term
| Fast Ethernet Standards: 100Base-TX |
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Definition
Specification: 802.3u
Medium: CAT 5 UTP
Distance: 100 meters
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Term
| Fast Ethernet Standards: 100Base-FX |
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Definition
Specification: 802.3U
Medium: Multimode Fiber
Distance: 412 meters for half duplex.
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Term
| Fast Ethernet Standards: 100Base-FX |
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Definition
Specification: 802.3u
Medium: Multimode Fiber
Distance: 2000 meters for full duplex |
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Term
| Fast Ethernet Standards: 100Base-FX |
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Definition
Specification: 802.3u
Medium: Singlemode fiber
Distance: 15,000 - 20,000 meters for full duplex |
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Term
| Gigabit Ethernet Standards: 1000Base-T |
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Definition
Specification: 802.3ae
Mediums: CAT 5 or CAT 6 UTP
Distance: 100 meters
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Term
| Gigabit Ethernet Standards: 1000Base-CX |
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Definition
Specification: 802.3z
Mediums: Shielded, Balanced Coax
Distance: 25 meters |
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Term
| Gigabit Ethernet Standards: 1000Base-SX |
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Definition
Specification: 802.3z
Medium: Multimode Fiber; 850 nm NIR wavelength
Distance: 550 meters in practice (220 meters per specification) |
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Term
| Gigabit Ethernet Standards: 1000Base-LX |
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Definition
Specification: 802.3z
Mediums: Single or Multimode Fiber; both 1300 nm wavelength.
Distances: 5000 meters Singlemode/500 meters Multimode |
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Term
| Gigabit Ethernet Standards: 1000Base-LH |
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Definition
Specification: 802.3z
Mediums: Single or Multimode Fiber; 1300 nm wavelength for both.
Distance: 10,000 meters Singlemode/550 meters Multimode
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Term
| 10 Gigabit Ethernet Standards: 10GBase-X |
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Definition
Specification: 802.3ae
Medium: Multimode Fiber; 850 nm wavelength
Speed: 9.953 Gbps
Distance: 65 Meters
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Term
| 10 Gigabit Ethernet Standards: 10GBase-SR |
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Definition
Specification:802.3ae
Medium: Multimode fiber; 850 nm wavelength
Speed: 10.31 Gbps
Distance: 300 meters |
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Term
| 10 Gigabit Ethernet Standards: 10GBase-SW |
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Definition
Specification:802.3ae
Medium: Multimode fiber; 850 nm wavelength
Speed: 9.953 Gbps
Distance: 300 meters |
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Term
| 10 Gigabit ethernet Standards: 10GBase-LR |
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Definition
Specification:802.3ae
Mediums: Singlemode fiber; 1310 nm wavelength, Dark Fiber
Speed: 10.31 Gbps
Distance: 10,000 meters |
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Term
| 10 Gigabit Ethernet Standards: 10GBase-LW |
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Definition
Specification:802.3ae
Medium: Multimode fiber; 1310 nm wavelength, SONET
Speed: 9.953 Gbps
Distance: 10,000 meters |
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Term
| 10 Gigabit Ethernet Standards: 10GBase-ER |
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Definition
Specification:802.3ae
Medium: Singlemode fiber; 1550 nm wavelength, Dark Fiber
Speed: 10.31 Gbps
Distance: 40,000 meters |
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Term
| 10 Gigabit Ethernet Standards: 10GBase-EW |
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Definition
Specification:802.3ae
Medium: Singlemode fiber; 1550 nm wavelength, SONET
Speed: 9.953 Gbps
Distance: 40,000 meters |
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Term
| 10 Gigabit Ethernet Standards: 10GBase-T |
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Definition
Specification:802.3an
Medium: CAT 5e, 6, or 7 UTP
Speed: 10 Gbps
Distance: 100 meters |
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Term
10 Gigabit Ethernet Standards: 10GBase-CX4
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Definition
Specification:802.3ak
Medium: Thin twin-axial cables
Speed: 4 x 2.5 Gbps
Distance: 25 meters |
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Term
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Definition
1 to 2 Mbps speeds.
Radio Frequency of 2.4GHZ.
Can use FHSS or DSSS |
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Term
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Definition
Speeds up to 54 Mbps
Frequency of 5GHz |
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Term
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Definition
Speeds of 11Mbps
2.4GHz Frequency |
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Term
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Definition
Speeds of up to 54 Mbps
2.4 GHz Frequency |
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Term
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Definition
Speeds of up to 300 Mbps
Can use both 2.4 GHz or 5.0 GHz frequency |
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Term
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Definition
| One of the 802.11 modes; Utilizes one or more WAPs to connect workstations to the cable backbone. |
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Term
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Definition
| 802.11 Mode; Also referred to as Independent Basic Service Set, utilizes a peer-to-peer configuration in which each wireless workstation talks directly to other workstations. |
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Term
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Definition
| Basic Service Set: Comprises one access point to a wired network and has one or more wireless stations or clients. |
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Term
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Definition
| Extended Service Set: Comprises two or more BSSs that are connected to a common distribution system such as a wired network. |
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Term
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Definition
| Independant Basic Service Set: Does not contain an Access Pint. It is a peer-to-peer network in which each client has its own wireless network adapter and acts as both client and wireless AP. |
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Term
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Definition
| management frames that are 50 bytes long, used to start and maintain wireless communications. |
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Term
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Definition
| Encryption protocol. Defines an algorithm that gives authorized users protection similar to a wired network. 64 and 128 bit options (40). |
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Term
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Definition
Wifi Protected Access. Improved encryption through TKIP. Generates a new dynamic key everytime someone connects. Added EAP (Extensible Authentication Protocol)
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Term
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Definition
| No security on the AP. Anyone can connect. |
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Term
| Shared Key Authentication |
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Definition
| Authentication type used by WEP. Connection is allowed if you type in the correct key. |
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Term
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Definition
| Authenticates the user rather than the workstation, by use of a third party. 3rd party is often a RADIUS server. |
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Term
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Definition
| Wireless protocol that is used to communicate from one device to another in a small area, usually less than 30 feet. Works using an RF-based media and does not need LOS to make connections. |
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