Acronyms
SFTP
Secure File Transfer Protocol
How many layers are in the OSI Model?
7
Which is ALWAYS static, a MAC Address or an IP Address?
MAC Address, it's set by the manufacturer at the time of the device's creation.
Where are frames created and destroyed?
The NIC (Network Interface Card)
What is Physical Topology?
The physical layout of devices on a network.
What's the main difference between copper cabling and fiber optic cabling?
Copper cabling uses electric pulses, where fiber optic uses light pulses!
What are the main benefits to using twisted pair cable?
Reduces EMI and crosstalk along the cable.
What are the three components that make up a fiber optic cable?
a Core surrounded by a cladding wrapped in the cable jacket.
What is a plenum?
A plenum is a space between a drop ceiling and the actual ceiling or the space between a raised floor and the actual floor.
DNS
Domain Name System
Name at least 4 of the layers to the OSI Model, bonus points for all of them.
Physical, Data Link, Network, Transport, Session, Presentation, and Application.
What does a repeater do?
Takes an incoming signal and repeats to all connected devices.
What does port 80 work with?
HTTP Protocols
What is a Logical Topology?
How data is sent between devices on a network.
What are the advantages and disadvantages to using coaxial cable?
Pros: Highly resistant to EMI and physical damage
Cons: Inflexible and expensive
What is the max distance of a UTP cable?
100 meters (approx. 325 feet)
What is multimode vs single mode?
Multimode designed to propagate light using an LED. Also usually orange cable.
Single mode designed to propagate light with laser light. Usually yellow cable.
Which type of cladding has the highest level of fire rating?
Plenum cable!
DHCP
Dynamic Host Control Protocol
What does a Frame Check Sequence do?
Confirms the data that was sent in an ethernet frame has all made it over to the destination.
How many numbers/characters are in a MAC address? How many bits is that?
12, in 6 pairs of 2. example: 50:1C:23:9B:A5:83
48-bits
How many Ports are reserved?
The first 1024 ports. The 'Well-Known" Ports.
What is the Bus Topology?
Oldest Topology, all hosts are connected by a single trunk cable. Disadvantages: All hosts share the same bandwidth, and if cable breaks, all hosts lose connection.
What is the current level of Radio Grade for coaxial cables? How much resistance does it have?
RG6, 75 Ohms Impedence
What type of connector does UTP use?
RJ-45
What are Duplex Cables?
Cables that have two connectors on each end, and send information in both directions!
What is riser cable cladding?
Designed to run between floors, less fire resistant than plenum
RDP
Remote Desktop Protocol
If Mike's working on Layer 3 of the OSI, what Layer is he working with?
The Network Layer
What is the broadcast MAC address? What does it mean to a NIC when it sees a broadcast MAC address?
ff:ff:ff:ff:ff:ff
This frame is for every computer that receives it.
What is TCP?
TCP Transmission Control Protocol, a connection-oriented conversation between two computers ensuring data transfers are whole, complete, and correct.
What is Star Topology?
Also called Hub and Spoke, each device connects to a box/router.
What kind of connectors does a coaxial cable use?
F connector (current), BNC (Twist connector, older connector)
What are the maximum speeds and maximum lengths of Cat 6 vs Cat 6a Cables?
Cat 6 10Gbps at up to 55 meters
Cat 6a 10Gbps at up to 100 meters with better EMI and crosstalk protection
What connectors do fiber optic cables use?
ST (round connector, old, push in and twist)
SC (square connector, old, push in and pulls out)
FC (round connector, old, screws in like coaxial)
LC (small rectangle, two cable outputs in a single connector)
MT-RJ (Small rectangle, two cable outputs ina a single connector)
What fire rating does PVC have?
Absolutely none. It's also called non-plenum because it shouldn't be used in a plenum space.
IMAP
Internet Message Access Protocol
What size chunks does the Transport layer split and put back together?
1500 bytes
When sending a packet to a device on a different network, what will the Destination MAC Address of the frame initially be?
It will be aimed at the default gateway (router).
What do Ports 20 and 21 work with?
FTP
What is a Mesh Topology?
Looks like a ring topology, but every host is connected to every other host. think like a Mess of cables. This creates Fault Tolerance, so if a cable breaks, it doesn't bring down the whole network, just damages the connection between the two affected devices. Usually seen in wireless networks, not wired.
What is Twinaxial cable?
Like coaxial cable, but features 2 twin inner conductors instead of coaxial's single inner conductor.
What are the speeds and limitations of Cat 8?
25 Gbps (40Gbps at 30 meters, 40GBASE-T network compliant)
What are the three types of polishing?
PC (Physical Contact, slightly rounded edges)
UPC (Ultra Physical Contact, More rounded than PC)
APC (Angled Physical Contact, 7-degree angle cut)
What's the hierarchy of fire ratings in the three types of cladding?
Gold: Plenum
Silver: Riser
Bronze: PVC/Non-Plenum