Network Theory Flashcards
a self-contained network that spans a relatively small area, such as a single building, floor, or room, although some can be significantly larger.
Local Area Network (LAN)
a network that spans a large area, often across multiple geographical locations. Typically connect multiple LANs and other networks using long-range transmission media.
Wide Area Network (WAN)
Covers and area equivalent to a city or a municipality.
Metropolitan Area Network (MAN)
covers an area equivalent to an academic campus or business park. Typically owned or used exclusively by an entity.
Campus Area Network (CAN)
connects two to three personal devices such as a smart phone connected to a laptop with cables, usually for a single person’s use.
Personal Area Network (PAN)
is a variation of a PAN that connects wireless devices in close proximity but not through a Wireless Access Point or Access Point (examples include Bluetooth and Infrared)
Wireless Personal Area Network (WPAN)
a self contained network of two or more devices connected by using a wireless connection. spans a small area, such as a small building, floor, or room.
Wireless Local Area Network (WLAN)
is the single largest global WAN, linking virtually every country in the world. Publicly owned and operated.
Internet
is a private network that uses Internet Protocols and Services to share a company’s information with its employees.
Intranet
is a network that includes elements of both LANs and WANs
Enterprise Network
layers work in one direction on one host and in the opposite direction on the remote host. Each layer processes the portion of the request corresponding to the procedures at that specific layer, then hands off the request to the next layer, each layer processing the request components within the layer’s protocols, processes, and structure. The model provides a theoretical representation of what happens to information being sent from one device to another on a network.
Open Systems Interconnection (OSI) model-
What are the 7 layers of the OSI model
Application, Presentation, Session, Transport, Network, Data Link, Physical
Enables applications on a network node (device) to request network services.
Application Layer (Layer 7)
Translates Application layer data into an intermediate form that both client and server can process.
Presentation Layer (Layer 6
Establishes and controls data communication between applications operating on two different devices, regulating when each device can send data and how much it can send. The two parties have to agree on how to communicate.
Session Layer (Layer 5)
Performs the actual establishment, maintenance, and tear down of the connection. Optionally divides long communications into smaller segments, including error recognition and correction, and data receipt acknowledgement.
Transport Layer (Layer 4)
Adds logical addressing (network addresses) and chooses the best route.
Network Layer (Layer 3
Structures the data into a format appropriate for the transmission medium. Adds physical addresses such as media access control (MAC) addresses or frame relay data link connection identifier (DLCI) numbers. Usually includes simple error checking.
Data Link Layer (Layer 2)
Transmits bits (binary digits) from one device to another and regulates the transmission stream over a medium (wire, fiber optics, or radio waves)
Physical Layer (Layer 1)
Protocols and Network Devices associated with the Application Layer (Layer 7)
HTTP, FTP, SMTP, IMAP - Application proxy
Protocols and Network Devices associated with the Presentation Layer (Layer 6)
Encryption, compression, character sets, multimedia formats, MIME types, codecs, etc. - Application proxy
Protocols and Network Devices associated with the Session Layer (Layer 5)
TCP and UDP PORT numbers - Firewalls
Protocols and Network Devices associated with the Transport Layer (Layer 4)
TCP and UDP PROTOCOLS - Firewalls
Protocols and Network Devices associated with the Network Layer (Layer 3)
IP, ICMP, and IGMP protocols - Layer 3 Switches, Routers and Firewalls
