Essay Questions Networking Ch. 1-4

Both extranets and intranets use the same technologies as the internet. Intranets are only open to those inside an organization, while extranets are provided to invited users outside the organization. Intranets can include public access (accessible to anyone) or private access (can use a completely separate web server hidden from the internet). Extranets can provide access to information services, inventories, and other internal organizational databases.

Both connection-oriented transmission and connectionless transmissions are in the transport layer of the OSI model. In connection-oriented transmissions the receiving system acknowledges received data, but in a connectionless transmission the receiving system does not acknowledge receipt of data. Connection-oriented is reliable but has slow communication, while connectionless transmissions are not reliable and are faster.

The advantages of a DSN: high security, domain objects are centrally managed, provides support for heterogeneous networking, and security boundaries are defined through logical domains. The disadvantages of a DSN: network and domain designs can be complex and difficult to maintain, domain administrators require specialized training, one domain controller has to be running at all times, and administrators have to have access to a domain controller when making a change to the domain.

utilizes a single main cable that runs throughout the network, uses a coaxial cable. Advantages of a bus topology are: thinnets are inexpensive to install, workstations can be easily added, use less cable than other topologies, works well with smaller networks. The disadvantages of a bus topology are: if a cable breaks the network is down, access time and network performance degrade when more devices are addded, the maximum bandwidth for thinnet is no more than 10Mbps, and its difficult to locate problems.

A thinnet network or (10base2) , uses a thin coaxial cable with up to 150 nodes. A thicknet network or (10base5), uses a thick coaxial cable with up to 300 nodes.

The most commonly seen topology, is installed in a star shape and has a central connection point (hub/switch). The advantages of a star topology are: its easy to add more devices, hardware is inexpensive and easy to install, the failure of one cable doesn't bring down the entire network, the hub provides centralizes management, and it is easy to find and fix cable problems. The disadvantages of a star topology are: requires more media, the failure of a hub can bring down the entire network.

A logical topology is a description of how devices on a LAN communicate and transmit data and a physical topology is the physical structure of a network, which describes how connections are made between computers.