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Elective 2 – Windows Server Management
By: Aaron Angeles
OSI Layers Network Terms Subnets
Topics
Multimedia – OSI Layers
media\2276_1_A_OSI.htm
OSI
1978
to define a unifying standard for the architecture of networking systems
International Telegraph and Telephone Consultative Committee and International Organization for Standardization (ISO)
Officially rolled out by ISO as Open Systems Interconnection model by 1984.
OSI Layers
OSI Layers7 Layers:7 - Application6 - Presentation5 - Session4 - Transport3 - Network2 - Data-Link1 - Physical
“All People Seem To Need Data Processing”
Each layer defines networking tasks
Each layer communicates with the layers above and below it
Layer 7 provides services for programs to gain access to the network
Layers 1 & 2 define the network’s physical media and related tasks
OSI
Application Layer ( Layer 7)
Provides an entrance point for programs (e.g. web browsers, e-mail system) to gain network services
Represent application programming interfaces (APIs) that developers can use to perform network functions when building applications
OSI
Presentation (Layer 6)
◦ Translates data between computing systems on a network
◦ Performs:
– data encryption
– data compression
– data conversion
OSI
Session (Layer 5)
◦ Enables two application to create a persisten communication connections.
◦ Ensures that both sender and receiver are ready to communicate
OSI
Transport (Layer 4)
◦ Ensures packets are delivered in order in which they are sent without loss or duplication.
◦ On the sending side, this layer is responsible for braking down larger messages into smaller packets for transmission
◦ On the receiving end, this layer is responsible for reassembling the packets into a single message to pass up to the upper layer
OSI
Network (Layer 3)
◦ Determines the physical path of the data to be transmitted based on the network conditions, priority of server and other factors.
◦ The only layer that uses logical networking and can move packets between different networks.
OSI
Data-link (Layer 2)
◦ Provides error free transfer of data frames from one computer to another over the physical layer. The Media Access Control (MAC) address of the network card exists at this layer that is added to the packet to create a frame.
OSI
Physical Layer (Layer 1)
◦ Establishes the physical interface and mechanisms for placing a raw stream of data bits on the network cabling.
◦
OSI
TCP/IP in Relation with OSI
Video
OSI
TCP/IP Protocol Suite
◦ Is an industry standard suite of protocols that provides communication in a heterogeneous environment.
◦ Only has four layers: Application Transport Internet Network Interface
OSI
OSI
TCP/IP in Relation to OSI Model
OSI
Network Terms
Hubs – operate at the physical layer of the OSI model.- Can only perform tasks with the
electrical signal on the network - regenerate 1s and 0s on network
cabling- unable to make decisions about where the regenerated signal should be sent.- synonymous to a “Repeater” - sometimes called as a “Multiport Repeater”
Network Terms
Bridge- is a network device that are able to control network traffic based on MAC addresses.
Switches- has the same functionality of a bridge- creates a table that lists port location of each computer and direct packets to the destination computer.
Network Terms
Routers- operate at the network layer of the OSI model.- moves packets from one logical networks to another
Gateway- is a device that converts one protocol to another.- can operate at any layer of the OSI Model, depending on which protocol is being converted. (e.g. SNA gateway)
Network Terms
HTTP – Hypertext Transfer Protocol (80) - specifies the client/server interaction
processes between web browsers and servers
FTP – File Transfer Protocol (21)- Performs file transfer and basic file
management task on remote computers
Network Terms
SMTP – Simple Mail Transfer Protocol (25)- carries email messages between
servers and from client to servers
DNS – Domain Name System (53)- Resolves internet host names to IP
addresses for network communications.
Network Terms
POP3 – Post Office Protocol Version 3 (110)- used by mail clients for reading
emails
SNMP – Simple Network Management Protocol (161)
- enables to collect information about network devices such as hubs, routers and bridge.
Network Terms
TCP – Transmission Control Protocol- provides connection-oriented reliable
communications for applications
UDP – User Datagram Protocol- provides connectionless and
unreliable communication.
Network Terms
IP – Internet Protocols- addresses and routes packets between hosts and networks.
ARP – Address Resolution Protocol.- obtains hardware address of hosts
located on the same physical network
Network Terms
IGMP – Internet Group Management Protocol- manages host membership in IP
multicast groups
ICMP – Internet Control Message Protocol- Sends messages and reports errors
regarding the delivery of a packets.
Network Terms
Subnet Mask
Subnet Mask- defines the part of an IP address that is the network ID and the part of an IP address that is the host id.- composed of four octets, similar to an IP address
Subnet Mask
Video
Subnetting