Chapter 6
The following is a valid IP address:
128.23.86.2
The maximum length of the Ethernet Data Field is ___________ octets.
1500
T1 leased lines run at a speed of about ________.
1500 kbps
An Ethernet data field is 40 octets long. The length of the PAD is
6 octets long.
The ________ standard was created to prevent attackers from walking in and simply plugging a computer into a wall jack and therefore accessing the network.
802.1X
What 802 Working Group creates Ethernet standards?
802.3
The following is a valid MAC address:
E5-47-55-C4-5B-AA
________ provides the same transmission speed as a T1 line.
HDSL2
What organization creates Ethernet standards?
IEEE
At what layer is the 100BASE-TX standard?
Physical
A VLAN ID would be found in a ________ field.
Tag Control Information
Which of the following can be used to increase reliability considerably in an Ethernet LAN?
Using the Rapid Spanning Tree Protocol.
A closed collection of servers and the clients they serve in a switched network. Broadcast signals from servers and printers go only to computers in the closed collection.
VLAN
________ connect hosts to the network.
Workgroup switches
An Ethernet switch knows ________.
a single port number for each MAC address
VLANs address the problem of ________.
congestion
Switches farther up the hierarchy that carry traffic via trunk lines between switches and routers are called
core switches.
The Ethernet length field gives the length of the ________.
data field
If an Ethernet receiver detects an error in an arriving frame, it ________.
drops the frame
A leased line runs at a speed of 256 kbps. This probably is a ________ line.
fractional T1
Ethernet receivers detect errors by using the value in the ________ field.
frame check sequence
Switches in an Ethernet LAN are organized in a ________ topology.
hierarchy
Ethernet became the dominant LAN technology because of its ________.
low cost, compared with competing technologies
The use of two or more trunk lines between a pair of switches is ________.
possible through link aggregation
Companies that want to link various sites together into a WAN can 1) used leased lines (requires the company to configure and manage them) ; 2) use the Internet; or 3) outsource the work of running a switched data network connecting its sites together through a(n)
public switched data network
LANs that span distances of several kilometers by using multimode fiber are made possible by ________.
regeneration
In a routed LAN, routers divide the LAN into smaller groups of Ethernet switches called ________.
subnets
A DLCI in Frame Relay is a ________.
virtual circuit number
POE can provide enough power over UTP for ________.
wireless access points