Exam 13: Ethernet, switches, and Virtual Lans

A seven-octet pattern of alternating 0s and 1s used by the receiver to establish bit synchronization is a ________.

_________ makes it possible to distribute both power and data using Ethernet cabling.

This long-wavelength option supports duplex links of up to 550 m of 62.5-μm or 50-μm multimode fiber or up to 5 km of 10-μm single mode fiber.Wavelengths are in the range of 1270-1355 nm.

A _________ is a logical subgroup within a LAN that is created by software rather than by physically moving and separating devices.

A hub uses a ________ wiring arrangement to attach stations to the hub.

The strength of Ethernet lies in its backward compatibility, industry support,and simplicity.

Routing takes place at the ___________ layer.

PoE makes it possible to distribute both power and data using Ethernet cabling.

The original commercial Ethernet,as well as the original IEEE 802.3 standard,operated at 100 Mps.

This option supports 1-Gbps links among devices located within a single room or equipment rack,using copper jumpers (specialized STP cable that spans no more than 25 m).Each link is composed of a separate STP running in each direction.

The most widely used high-speed LANs in today's enterprise networks are referred to as _________ and were developed by the IEEE 802.3 standards committee.

___________ refers to a set of specifications developed by the IEEE 802.3 committee to provide a low-cost,Ethernet-compatible LAN operating at 100 Mbps.

It may happen that two or more stations attempt to transmit at about the same time; if this happens,there will be a _________ .

A malfunctioning device can create a _________ ,in which numerous broadcast frames clog the network and crowd out legitimate traffic.

The sequence 10101011,which indicates the actual start of the frame and enables the receiver to locate the first bit of the rest of the frame,is the ______.

This short-wavelength option supports duplex links of up to 275 m using 62.5-μm multimode or up to 550 m using 50-μm multimode fiber.Wavelengths are in the range of 770-860 nm.

Because of increased functionality of modern layer 2 switches, bridges have been replaced by these types of switches.

A MAC frame includes various bit patterns to enable a receiver to correctly recognize key parts of the information contained in the frame.

The _________ specifies the station(s)for which the frame is intended.It may be a unique physical address,a group address,or a broadcast address.

In a _________ LAN,all stations attach,through appropriate hardware interfacing known as a tap,directly to a linear transmission medium,or bus.