2.2 Network Devices Flashcards
Some network devices are combined together like routers/switches/and firewalls. T or F?
True
What is the purpose of routers?
Routes and forwards traffic between IP subnets based on IP address
What are routers inside of switches sometimes called?
Layer 3 switches
What network types can a router connect? (4)
LAN, WAN, copper, fiber
How do switches know where to forward data?
Based on data link address (source/destination MAC address)
The bridging done by switches is carried out by what hardware?
ASIC (Application-specific integrated circuit)
What’s another name for data link address?
MAC address
What network device is the core of an enterprise network?
switches
What network device may provide PoE?
switches
What type of switch provides routing functionality?
a multilayer switch
What is an unmanaged switch?
Plug and play (very few configuration options)
Unmanaged switches don’t allow VLANs. T or F?
True
What type of switch allows very little integration with other devices?
Unmanaged switch (it has no management protocols)
Which has a lower price point, unmanaged or managed switches?
unmanaged
What type of switch provides VLAN support?
managed switches
What does a switch with VLAN support allow it to do?
interconnect with other switches via 802.1Q
Which type of switch allows traffic prioritization? What type of traffic gets higher priority? (2)
Managed switch
Voice traffic gets higher priority
What does STP stand for? What is it used for? (2)
Spanning Tree Protocol
It is used on managed switches for redundancy support
SNMP is available on what type of switch?
Managed switches
Managed switches allow port mirroring. What is this?
Port mirroring is used on a network switch to capture packets on one port and send copies to a network monitoring connection on another switch port
(keeps an eye on network performance)
Is an access point and a wireless router the same thing?
No, a wireless router is a router AND an access point in a single device
What is an access point?
A bridge that extends the wired network onto the wireless network
(increases the scope of the wired network to become wireless)
How does an access point make forwarding decisions?
based on MAC address
A cable modem is used for what type of connection?
Broadband
Broadband transmissions are across what frequencies?
multiple
What are the types of traffic seen on broadband networks?
different traffic types
What does DOCSIS stand for?
Data over Cable Service Interface Specification
Data on the “cable” network is known as?
DOCSIS (data over cable service interface specification)
For cable networks, speeds up to ____ are available
Speeds up to 1 Gigabit/s
Cable provides multiple services such as: (3)
Data
Voice
Video
What does ADSL stand for?
Asymmetric Digital Subscriber Line
What does ADSL use?
telephone lines
What does asymmetric mean in terms of DSL modems?
The download speed is faster than the upload speed
What is the distance limitation for DSL?
10,000 foot limitation from the central office (CO)
What speeds are common for DSL?
52 Mbit/s downstream
16 Mbit/s upstream
Faster DSL speeds may be possible if….?
may be possible if located closer to the CO
Patch panels are a combination of what 2 things?
Punch-down blocks
RJ-45 connectors
Runs from desks are made multiple times and can be removed from the patch panel. T or F?
False
Runs from desks are made once and permanently punched down to patch panel
What is required to connect a patch panel to a switch?
Use the existing cables, no special tools required and can be easily changed
How do firewalls filter traffic? (2)
by port number, and some can filter based on the application
Firewalls work in what layer of the OSI model?
OSI layer 4 (TCP/UDP)
What can encrypt the traffic coming into/out of the network and protect your traffic between sites?
Firewalls
What can you use to proxy traffic?
a firewall (a common security technique)
Most firewalls can be what type of devices?
Layer 3 devices (routers)
With PoE, can 1 wire function as both network and electricity?
Yes
Phones, cameras, and wireless access points in difficult-to-power areas can be powered by?
PoE
How is power provided for PoE?
at the switch
PoE with built-in power is called?
Endspans
(power at the switch is the END of it)
PoE that needs an in-line power injector is called what?
Midspans
Where are midspans placed?
between a network switch and powered devices
What is the original PoE specification called and when was it introduced? (2)
PoE: IEEE 802.3af
2003
The original PoE spec provided how many watts of DC power, and how many mA of max current?
15.4 watts DC power
350 mA max current
What is the 2nd PoE standard called? When was it introduced? (2)
PoE+: IEEE 802.3at
2009
The 2nd specification of PoE provided how many watts of DC power, and how many mA of max current?
25.5 watts DC power
600 mA max current
What is the 3rd PoE specification called? When was it introduced?
PoE++: IEEE 802.3bt
2018
The 3rd spec of PoE provided how many watts of DC power, and how many mA of max current?
Type 3: 51 W, 600 mA max current
Type 4: 71.3 W, 960 mA max current
What’s the network speed for PoE++?
PoE with 10GBASE-T
A hub is known as a?
multi-port repeater
What is a multi-port repeater?
traffic going in one port is repeated to another port
With what device is everything half-duplex?
a hub
What is half-duplex?
communication in both directions but one direction at a time
What network device becomes less efficient as traffic increases?
a Hub
What are the speeds for a Hub?
10 megabit/ 100 megabit
What does ONT stand for?
Optical Network Terminal
ONT is for what kind of network?
Fiber
What is a demarcation point?
the physical point at which a telecommunications company’s public network ends and the customer’s private network begins
ONT leads to a terminal box on the side of the building where one side is the ISP responsibility and the other side is your network. T or F?
True
What does NIC stand for?
Network Interface Card
Every device on a network has a ___
(phones, computers, servers, printers, routers, switches, tablets, cameras, etc)
NIC
Is a NIC specific to the network type?
Yes (Ethernet, WAN, wireless, etc)
Where are NICs often located?
Built-in to the motherboard or added as an expansion card
NIC has many options like… (4)
single port
multi-port
copper
fiber
