CH3 - Course Quiz Flashcards
The original Ethernet Networking technology standard was based on a Ring Topology?
True
False
False
A _______ is a special Spanning Tree Protocol (STP) frame that switches use to communicate with other Switches to prevent Switching Loops from happening in the first place?
Switch Protocol Data Unit (SPDU)
Repeater Protocol Data Unit (RPDU)
Bridge Protocol Data Unit (BPDU)
Root Bridge
Bridge Protocol Data Unit (BPDU)
How many pins does an RJ-45 Connector have?
6
4
8
2
8
How many pairs of wires in a cable did a 10Base-T device require?
4
6
8
2
2
When a collision occurs on a Network relying on the CSMA/CD access method, what alerts the Network Interface Cards (NICs)?
Spanning Tree Protocol
Cyclic Redundancy Check
Overlapping Signals
Multiple Access
Overlapping Signals
What is the max number of Nodes that could be attached to a 10Base-T hub?
1024
10
1000
16
1024
What is the min size of an Ethernet frame?
64 bytes
1024 bytes
1500 bytes
256 bytes
64 bytes
Which pins on an RJ-45 connector are used to Receive data?
3 and 4
1 and 2
3 and 6
7 and 9
3 and 6
The preamble is added by the sending Network Interface Card (NIC)?
True
False
True
Which mechanism will move a port into a root-inconsistent state if BPDUs coming from a certain direction indicate another Switch is trying to become the Root Bridge?
topology change notification (TCN)
root stop
PortFast
root guard
root guard
What was the max distance between a hub and a node on a 10Base-T Network?
500 m
50 m
100 m
5 m
100 m
What is an advantage of Fiber-Optic cabling?
susceptible to electrical interference
signals travel more slowly
easier and cheaper to install than UTP
greater max distance
greater max distance
A Repeater also functions as an amplifier?
True
False
False
When using the newer Rapid Spanning Tree Protocol (RSTP), how long does it take a Network to return to convergence?
6 Seconds
50 Seconds
2 Seconds
25 Seconds
6 Seconds
What was the original max data transfer rate of the first Ethernet developed by Xerox?
16 Mbps
56 Kbps
3 Mbps
10 Mbps
3 Mbps
What’s the meaning of the Term “Carrier Sense” on an Ethernet Network?
Carrier Sense examins the cable before sending a Frame, if another machine is using the Network, the node detecs traffice on the segment and waits a few milliseconds, then rechecks. If it detects no traffic, the node sends out its frame.
Explain Carrier-Sense Multiple Access with Collision Detection (CSMA/CD)?
Determines which computer should use a shared cable at a given moment.
Explain the difference between Half-Duplex and Full-Duplex Modes?
Half-Duplex means communication happens in one direction, either Sending OR Receiving at one time.
Full-Duplex means that the communication happens Both at the same time, Sending AND Receiving.
Explain why 2 nodes connected to a Switch can send data at the same time without the occurence of a collision?
Each Port on a Switch is its own Collision Domain, and Switches can buffer incoming frames.
What happens if 2 machines, both listening to the cable, simultaneously decide that it is free and try to send a frame?
Collision happens and both transmissions are Lost.
Fiber-Optic cabling transmits data packets using pulses of ________?
light.
10Base-T Networks use the ________ topology?
Star-Bus
The classic 10Base-T Network consists of 2 or more computers connected to a Central _________?
hub.
CSMA/CD was a Network Access method that mapped to the ________ standards for Ethernet Networks?
IEEE 802.3
A 10Base-T Network uses ________ connectors?
RJ-45
Which Ethernet cabling standard defines an Ethernet Network that uses Cat 3 or better UTP cabling, operating at 10 Mbps?
100Base-TX
10Base-FL
10Base-T
10Base-2
10Base-T
How long is the start frame delimiter?
1 byte
2 bytes
4 bytes
7 bytes
1 byte
In a specification such as 10Base-T, what does the word “BASE” identify?
max number of Hubs
max number of Routers
max IP Address size
signaling type
signaling type
What information is included in the data portion of an Ethernet Frame on an IP Network?
frame check sequence (FCS) number
IP Addresses of the Source and Destination Systems
padding information
length of the data being transmitted
IP Addresses of the Source and Destination Systems
What is the purpose of a Crimper?
connect an RJ-45 connector to the cable
install a NIC in a PC
connect a NIC to a hub
attach the RJ-45 connector to the NIC
connect an RJ-45 connector to the cable
Configuration Bridge Protocol Data Units (BPDU) establish the topology, where one Switch is elected ______ and acts as the center of the STP Universe?
Lead Port
Top Port
Root Guard
Root Bridge
Root Bridge
Which statement best describes the Preamble of an Ethernet Frame?
It contains the MAC Address of the Source and Destination
It includes a 7-byte series of alternating ones and zeros followed by a start frame delimter.
It contains the CRC
It contains the IP Address of the Source and Destination and is used by Routers to deliver the Frame to the proper location.
It includes a 7-byte series of alternating ones and zeros followed by a start frame delimter.
Explain the limitations of 10Base-T?
Cable Distance and the Number of Computers
Distance 100m
Number of Computers 1024
Briefly explain why Fault Tolerance can motivate an organization to add more Switches?
Every node on the Network connects to the same Switch, that Switch becomes a single point of failure, if it fails, everybody drops off the Network, so add more…
In terms of cabling, how is 10Base-T Network different from a 10Base-FL Network?
10Base-T uses Cat 3 or Better UTP
10Base-FL uses multimode Fiber with ST or SC connectors.
How would an administrator configure a Switch port directly connected to a PC to NOT participate in STP?
They can manually change STP settings for a Switch.
A Switch port directly connected to a PC should NEVER participate in STP and could be configured with a setting called PortFast that enables the interface to come up right away, without the normal latency introduced by STP.
Originally, Ethernet used _________ cabling?
coaxial
The original Spanning Tree Protocol, introduced by IEEE as 802.1d, was replaced a long time ago by the ____________, 802.1w?
Rapid Spanning Tree Protocol (RSTP)
As it forwards all frames, a Switch copies the Source MAC Addresses and quickly creates a Table called a ___________ table containing the MAC Addresses of each connected computer?
MAC
Most UTP cables come with stranded __________ fibers to add strength to the cable?
kevlar
The Ethernet standards body adopted the ________ to eliminate the problem of accidental Switching Loops?
Spanning Tree Protocol (STP)
The 802.3 working group defines wired Network Standards that share the same basic frame type and ________?
preamble size
type of cabling
physical bus topology
network access method
network access method
Which standard used Multimode Cabling?
10Base-FL
Cat 6
10Base-T
Cat 5e
10Base-FL
Regardless of the Implementation of an Ethernet Network, the design of the Frames remains the same?
True
False
True
The Ethernet Frame Type tells you if the Frame carries higher-level data, such as an Email Message or a Web Page?
True
False
False
Describe how each PIN on the RJ-45 Connector is used?
Each pin connects to a single wire inside the cable, this enables the device to put voltage on the individual wires within the cable.
The Pins are numbered from 1 to 8.
When the Spanning Tree Protocol (STP) is used, what is done to prevent accidental Switching Loops?
Switches have STP enabled by Default, and communicate with other Switches to detect/block redundant links/paths to prevent Loops before they happen.
Explain two ways that the use of Frames improves Network Communication?
First - Frames prevent any single machine from monopolizing the shared bus cable.
Second - They make the process of re-transmitting lost data more efficient.
10Base-T devices use pins 1 and 2 to __________ data?
send
The ________ defines the industry standard for correct crimping of four-pair Unshielded Twisted Pair (UTP) for 10Base-T Networks?
TIA/EIA
Telecommunications Industry Association/Electronics Industry Association
Because on 10Base-T and 10Base-FL used different types of Cable, you could use a ________ to interconnect different Ethernet types?
media converter
Explanation:
The key word is “Interconnect”.
If this was from the back of a Switch, then you would use the MSA (Multisource Agreement Modules).
In an Ethernet Network, the ________ system is used to determine which computer should use a shared cable at a given moment?
carrier-sense multiple access with collision detection (CSMA/CD
10Base-FL used __________ 62.5/125um (OM1) fiber-optic cabling and employed either an SC or ST connector?
multimode
