Different parts of network use different media; Network congestion; Packets may take different routes; The receiver may be busy; Physical size of the network;

Virtual Private Network gives privacy online .EX:Business ,organisations ,Govts etc. Data is encrypted and decrypted. It provides extra server for security.

•Wireless Fidelity Used in laptops/mobile devices to connect wirelessly to home network Allows relatively slow to fast data transmissions (depending on the vers

The Media access control address identifies a specific device (network card/controller).It prevents unauthorised access by providing extra layer to authenticat

1.Resources are more widely available. 2.Supports file sharing for collaborative work 3.No central server

Worldwide Interoperability for Microwave Access • Designed for large distance high speed internet access

1.Data Integrity 2.Manage flow control 3.Prevent deadlock 4.Manage congestion 5.Error checking

Application layer,Presentation layer,Session layer,Transport layer,Network layer, Datalink layer and Physical layer

Some compression methods (lossy) discard data; Decompression will not return the complete file,if original is lost no recovery

The Memory Address Register holds the memory location of data/instructions that need to be accessed(read/write)(fetch/store)

A packet is a bit of data that is sent for transmission over the digital network with a format.It has data and address.

Protocols are a set of rules so that both sender and receiver are using same formats/methods to enable successful communication without errors.

virtual LAN is a logical group of workstations,servers and network devices that appear to be on same LAN despite their geo distri for security,traffic mgmt.