Data Communications: Chapter 5
CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________.
1 Gbps
________ links connect users to workgroup switches.
Access
________ describe light entering a fiber's core at different angles.
Different modes
The ARP cache gives the ________ of a router the host will send a packet to.
EUI-48 address
After an ARP cache poisoning attack, the ARP cache gives the ________.
EUI-48 address of the router the MITM attacker
The ability to transmit in two directions simultaneously is ________.
full-duplex communication
Fiber that has a core diameter of 8.3 microns is ________.
single-mode fiber
What type of switch connects users to the network?
workgroup switches
How long (in milliseconds) is a clock cycle if I transmit 400 Mbps with four states?
0.000005
What 802 Working Group creates Ethernet standards?
802.3
All Ethernet switches are manageable.
False
What organization (most specifically) creates Ethernet standards?
IEEE
Four-pair UTP uses ________ connectors.
None of these ST or SC binary universal
The strength of a wave is its ________.
amplitude
In optical fiber, light travels through the ________.
core
What type of switch connects switches to other switches?
core switches
Ethernet has reliability issues because of its ________.
hierarchical organization
In Ethernet, switches are organized in a ________.
hierarchy
Ethernet became the dominant LAN technology because of ________.
low cost
Modal dispersion limits transmission distance in ________.
multimode fiber
In 4-pair UTP, what is twisted?
pairs of wires
In binary signaling, there is (are) ________ state(s).
two
Ethernet addresses were formerly called ________ addresses.
MAC
What is the quality designator for multimode optical fiber?
OM
________ fiber is being sold today.
OM4
4-pair UTP terminates in a(n) ________ connector.
RJ-45
In this book, we use the terms Ethernet and 802.3 interchangeably.
True
Ethernet standards are specified at the ________ layer.
physical
What is 9 hex in binary?
1001
Two switches that are 200 m apart at a speed of 20 Gbps should be connected using ________.
10GBASE-SR with bonding
Which core diameter is used in multimode fiber.
50 microns
How many wires are there is a UTP Ethernet cord?
8
The 802.11ac Wi-Fi standard uses 256 states. How many bits can it send per clock cycle?
8
To prevent an unauthorized user from sending supervisory commands to switches, companies use ________.
802.1AE
ARP cache poisoning is ________.
a man-in-the middle attack
Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second?
category 6A
Optical fiber cords use two strands ________.
for full-duplex transmission
Ethernet messages are ________.
frames
Optical fiber cords typically have two fiber strands. This is done to allow ________.
full-duplex operation
UTP categories rate the ________ of UTP cabling.
quality
What problem limits transmission distance in 4-pair UTP?
radiation
Having only a single possible path between devices ________.
reduces switching cost
For what specific purpose were the 2.5GBASE-T and 5GBASE-T standards developed?
serving access points
Physical layer standards govern ________.
signaling
The longest transmission distances are possible with ________.
single-mode fiber
Ethernet forwarding devices are ________.
switches
When a user attempts to plug into an Ethernet switch protected by 802.1X, ________.
the user will be required to authenticate himself or herself
Signal state is held constant in a clock cycle ________.
to make it easier for the receiver to sample the state
The distance between two corresponding points in adjacent cycles is the ________.
wavelength
In large Ethernet networks, there can be ________ possible data links between two hosts.
1
To transmit five bits per clock cycle, you must have ________ states.
32
If a physical link can use either 4-pair UTP, multimode fiber, or single-mode fiber, which should I use?
4-pair UTP
What type of copper wiring is widely used in Ethernet?
4-pair UTP
Which light wavelength dominates in LANs?
850 nm
Which of the following is used most often in LANs for fiber transmission links?
850 nm multimode fiber
The switch knows the type of device it is forwarding a frame to.
False
________ links connect switches to other switches.
Trunk
Which of the following provides security in Ethernet?
VLANs