Exploration1-Chapter02 - CCNA Exploration Network...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
KC KHOR, Multimedia Univ. Cyberjaya 1 CCNA Exploration   Network Fundamentals Chapter 02 Communicating Over The Network
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
KC KHOR, Multimedia Univ. Cyberjaya 2 The Elements of Communication Communication begins with a message, or information, that must be sent from one individual or device to another using many different communication methods. All of these methods have 3 elements in common: - message source, or sender - destination, or receiver - a channel
Background image of page 2
KC KHOR, Multimedia Univ. Cyberjaya 3 Communicating The Messages Data is divided into smaller parts during transmission - Segmentation The benefits of doing so: - Many different conversations can be interleaved on the network. The process used to interleave the pieces of separate conversations together on the network is called multiplexing . - Increase the reliability of network communications. The separate pieces of each message need not travel the same pathway across the network from source to destination
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
KC KHOR, Multimedia Univ. Cyberjaya 4 Downside of segmentation and multiplexing - level of complexity is added (process of addressing, labeling, sending, receiving and etc are time consuming) Each segment of the message must go through a similar process to ensure that it gets to the correct destination and can be reassembled into the content of the original message Various types of devices throughout the network participate in ensuring that the pieces of the message arrive reliably at their destination
Background image of page 4
KC KHOR, Multimedia Univ. Cyberjaya 5 Components of the Network Devices (PCs, intermediary devices) Media (Cable or wireless) Services and processes (Software)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
KC KHOR, Multimedia Univ. Cyberjaya 6 End Devices and Their Roles In the context of a network, end devices are referred to as hosts . A host device is either the sender or receiver To distinguish one host from another, each host on a network is identified by an address. A host (sender) uses the address of the destination host to specify where the message should be sent. Software determines the role of a host. A host can be a client, server or both
Background image of page 6
KC KHOR, Multimedia Univ. Cyberjaya 7 Intermediary Devices and Their  Roles Examples: - Network Access Devices (Hubs, switches, and wireless access points) - Internetworking Devices (routers) - Communication Servers and Modems - Security Devices (firewalls)
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
KC KHOR, Multimedia Univ. Cyberjaya 8 Processes running on the intermediary network devices perform these functions: - Regenerate and retransmit data signals - Maintain information about what pathways exist through the network and internetwork - Notify other devices of errors and communication failures - Direct data along alternate pathways when there is a link failure - Classify and direct messages according to QoS priorities - Permit or deny the flow of data, based on security settings
Background image of page 8
KC KHOR, Multimedia Univ. Cyberjaya 9 Network Media
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/29/2008 for the course ICTN 2154 taught by Professor Khoury during the Spring '08 term at East Carolina University .

Page1 / 37

Exploration1-Chapter02 - CCNA Exploration Network...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online