ICT-242 7
What are the latest 10-Gbps Ethernet standards?
10GBase-fiber, 10GBase-T, 10GBase-CS
What is the definition of a local area network?
A communication network that interconnects a variety of data communicating devices within a small geographic area and broadcasts data at high data transfer rates with very low error rates.
What is meant by a passive device?
A signal that enters is neither amplified nor regenerated. The signal is simply passed on.
What is meant by a bidirectional signal?
A signal that propagates in either direction on a medium.
What are the basic functions of a switch?
A switch examines a packet's destination address and routes the packet to the appropriate workstation.
List the advantages and disadvantages of local area networks.
Adv: Share files and devices, intercommunication. Disadv: Maintenance, complexity, costs.
What are the primary differences between baseband technology and broadband technology?
Baseband is a signal digital signal while broadband is analog and may carry many signals.
What are the basic layouts of local area networks? List two advantages that each layout has over the others.
Bus: Uses low noise coaxial cable, inexpensive taps. Star-wired bus: Simple to interconnect, easy to add components, most popular. Star-wired ring: Simple to interconnect and easy to add components (but no more so than star-wired bus).
What are the basic operating principles behind CSMA/CD?
CSMA/CD: Listen to medium, if no one transmitting, transmit. Continue to listen for collisions. If someone is transmitting, wait.
What is the difference between Fast Ethernet and regular Ethernet?
Fast Ethernet transmits at 100 Mbps while regular Ethernet transmits at 10 Mbps.
How is a full-duplex switch different from a switch?
Full duplex switch has one set of lines for receiving and one set of lines for transmitting, thus it can do both operations at the same time.
How does a switch encapsulate a message for transmission?
It really doesn't encapsulate anything. Switch looks at NIC/MAC addresses and forwards accordingly.
List the primary activities and application areas of a local area network.
List the primary activities and application areas of a local area network.
How does a transparent switch work?
Observes traffic on a LAN and creates a set of forwarding tables; filters traffic
What does the term 100BaseT stand for?
One hundred mega-bits per second transmission over baseband (digital) signals, using twisted pair wiring.
What is the difference between a physical design and a logical design?
Physical is the wiring and components, logical is how the software passes the data.
What is the primary advantage of power over Ethernet? The primary disadvantage?
Primary advantage is not having to run a separate power line to power device; primary disadvantage is making sure the switch has enough power to run PoE devices.
How does a switch differ from a hub?
Switch examines addresses, hub does not. A switch has multiple ports and takes the place of a hub.
What is cut-through architecture?
The device is passing the data packet on before it has even finished entering the device.
What purpose does a hub serve?
The hub is a collection point for workstations.
When referring to a hub or a switch, what is a port?
The port is the connection that is used to connect a workstation or another hub or switch to this hub or switch.
What is meant by link aggregation?
The process of combining two or more links into one logical fat link.
What is a medium access control protocol?
The software that allows a workstation to insert its data onto the LAN.
What is the purpose of a virtual LAN?
To create a logical subgroup of multiple workstations and servers.
What is meant by a "nondeterministic" protocol?
You cannot determine precisely when a workstation will get a chance to transmit (because of potential collisions).
