Upload
ravi-shairaywal
View
250
Download
2
Tags:
Embed Size (px)
Citation preview
Explain line configuration Explain different types of topologies Explain the types of networks Discuss the modes of transmission Discuss the hierarchical network model Discuss the OSI Layers
Chapter 1 2
A dedicated link exists between the two devices
Chapter 1 3
More than two devices share the same link
Chapter 1 4
Represents the physical layout of devices on a network
It is the arrangement of the devices on the network and the way they communicate with each other
Chapter 1 5
Bus
Star
RingTree
MeshPhysical Topology
This is used in a small area, an office or organization
Chapter 1 6
The computers can be connected to each other and other devices, printer or a modem
The rate at which the data is transmitted is very fast
This is used in a large geographical area, town or city Enables high speed connections using fiber optic
Chapter 1 7
This is used in a larger area than MAN, countries or cities
Chapter 1 8
Enables high speed connections using public networks, telephone lines, satellites, or leased lines
Only one device can transmit the data, whereas the other can only receive the data
Chapter 1 9
Chapter 1 10
Both devices can transmit and receive the data, but not simultaneously
Chapter 1 11
Both the devices can send and receive the data simultaneously
Chapter 1 12
The topmost layer of the OSI model Link between the user and the presentation layer
Chapter 1 13
Functions include› Authentication› File access, transfer and management› Directory Services
Chapter 1 14
Acts as a link between application and the session layer
Defines the forms of text, graphics, video or audio information that is to be sent to the user
Chapter 1 15
Responsible to validate and establish a connection between the users
Each session is divided into sub sessions Functions include
› Session Management› Synchronization› Dialog Control› Closing the session
Chapter 1 16
Responsible for source-to-destination delivery of the entire message
divides each message into segments and assigns a sequence number to each segment
Functions include› Service point addressing› End-to-end message delivery› Segmentation and reassembly› Connection control
Chapter 1 17
Three-Way handshake helps to establish the connection between the two devices
Chapter 1 18
This concept of deciding the window size without sending an acknowledgement is termed as Windowing
Chapter 1 19
Chapter 1 20
Responsible for routing and logical addressing Assigns IP addresses and routes the packets to the
destination Functions include
› Source-to-destination delivery› Logical addressing› Routing› Address transformation› Multiplexing
Chapter 1 21
Second layer of the OSI model Functions include
› Identifying the encapsulated data› Framing› Arbitration› Physical addressing› Error detection
Chapter 1 22
Responsible for transmitting a bit over the physical medium
Converts the data from the data link layer in a format that the communication medium can carry
Functions include:› Line configuration› Data transmission› Topology› Signals
Chapter 1 23
Half Duplex Full Duplex
One wire is used to connect the networks and transmit the data
Two wires are used to connect the networks and transmit the data
Chances of collision if client and server transmit data simultaneously
There are no chances of collision
It uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol
CSMA/CD not required hence the data transmission rate is 100 percent
Chapter 1 24
Frames are used to transfer the packets They perform the data security check and
ensure that the data is not corrupted
Chapter 1 25
The benefits of Cisco hierarchical model include› High performance› Efficient management and troubleshooting› Policy creation› Scalability› Behavior prediction
Chapter 1 26
Responsible for fast and reliable transportation of data across a network
Devices include› Cisco Switches in the 7000, 7200, 7500 and
12000 series for connecting to the WAN devices
› Catalyst Switches in the 6000, 5000 and 4000 series for connecting to the LAN devices
Chapter 1 27
Responsible for routing and managing network traffic
Functions include› Packet filtering› Access layer aggregation point› Control broadcast and multicast› Application gateways
Chapter 1 28
Layer ensures that the packets are delivered to the destination computers
Functions include› Address filtering› Separate collisions domain› Share bandwidth› Handle switch bandwidth
Chapter 1 29
Chapter 1 30
Chapter 1 31
Chapter 1 32
Unshielded Twisted Pair (UTP)
Shielded Twisted Pair (STP)
Chapter 1 33
Line configuration is the manner in which the devices are attached to the communication links
Topology is the way in which the devices are connected together in the network
Two types of line configuration are:› Point-to-point› Multipoint
Five basic topologies include› Bus› Star
Chapter 1 34
› Ring› Tree› Mesh
The types of network are› Local Area Network› Metropolitan Area Network› Wide Area Network
Modes of transmission › Simplex › Half Duplex› Full Duplex
Chapter 1 35
The hierarchical network model designed by Cisco provides a reliable, scalable and cost effective way to transfer information
The three layers of the network model are:› Core› Distributional› Access
Core layer is responsible for fast and reliable transportation of data on the network
Chapter 1 36
Distribution layer is responsible for routing and it manipulates the packets by queuing them
Access layer ensures that the packets are delivered to the destination computers
The Open Systems Interconnection (OSI) is the layered model for the network systems, which enables computers in the network to communicate with each other
Application layer provides an interface for the user to interact with the application
Chapter 1 37
The seven layers of the OSI model include:› Application› Presentation › Session › Transport› Network› Data Link› Physical
Chapter 1 38
Presentation layer is responsible for the delivery of information
Session layer controls the communication between the applications on the hosts
Transport layer is responsible for source-to-destination delivery of the entire message
Ethernet Frames are used by the Data Link layer to transfer the packets of data from the Network layer
Physical layer is responsible to transmit a bit over the physical medium
Chapter 1 39