SAN JOSE STATE UNIVERSITY
Department of Aviation &Technology
Tech 65: Networking Theory and Applications Dr. Julio R. Garcia
Class Participation Chapter 3: Network Topology and Technologies
Name: John Lacsamana Date: 9/16/2015
Note: You can work in groups but each student must submit his/her own answers. You can submit it via Canvas or give the hard copy to the instructor by the due date.
1. Is it important that Industrial Technology students have a working knowledge of network topology and technologies? Why?
Students should be able to know how network topologies work, how to set them up, and when to use certain topologies in certain situations because networking is critical in running a business due to importance of communication and file sharing.
2. Describe Physical Topologies.
Physical topologies are how the wiring and cables are connected to and from devices within a network.
3. Describe the advantages and disadvantages of the Physical Bus Topology, the Physical Star Topology and the Physical Ring Topology.
Advantage of bus- simplest and most common topology. Connects one computer to another
Disadvantage of bus- Limit of 30 computers per cable segment. Maximum total length of cabling is 186 meters. Both ends of the bus must be terminated. Limited to 10Mbps.
Advantage of star- Much faster technologies than a bus. Centralized monitoring and management of network traffic is possible. easier network upgrades.
Disadvantage of star- the central device represents a single point of failure. If hub or switch fails or someone kicks the power cord out of the outlet, the entire network goes down.
Advantage of ring- similar to bus because devices are daisy-chained together.
Disadvantage of ring- Data travels in one direction. If any station in the ring fails, data can no longer be passed along.
4. Explain the Extended Star topology.
An extended star is when several hubs or switches must be connected usually one device is used as the central connecting point, forming an extended star topology. A central device sits in the middle and instead of attached computers, other switches or hubs are connected to the central switch’s port. Data transfers depend on central device. Central device determines logical topology.
5. Describe the Point-to-Point Topology.
Direct link between 2 devices. Mostly used in WANs. Uses a wireless bridge to connect 2 computers.
6. Explain the Mesh Topology.
Mesh topology connects each device to every other device in a network. It is to ensure that if one or more connections fail, there’s another path for reaching all devices on the network. Found in large WANs and internetworks.
7. What’s the difference between Physical Topologies and Logical Topologies?
Physical topology- how the cables and wires are physically connected to devices within a network.
Logical topology- how data is transferred throughout a network.
8. Describe Network Technologies and Media.
Basically, Network technologies is whether your network uses Ethernet, 802.11 wireless, token ring, or some combination of these to move data from device to device in your network. Both LAN and WAN.
Media is the cabling such as an unshielded twisted pair (UTP) which is the most common media type for LANs. Fiber-optic used for long distances and at high data rates. Coaxial cable is used as a network medium for internet access via cable modem.
9. Explain the difference between Baseband and Broadband
Baseband- Sends digital signals in which each bit of data is represented by a pulse of electricity or light.
Broadband- uses analog techniques to encode binary 1s and 0s across continuous range of value.
10. Describe CSMA/CD
CSMA/CD= Carrier Sense Multiple Access with Collision Detection
Carrier Sense- Listen before send- must hear silence
Multiple access- if two or more stations hear silence, multiple stations may transmit at the same time.
Collision Detection- if two or more stations transmit, a collision occurs and is detected by the NIC; all stations must retransmit 