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Networking + Self Made > Chapter 7 - Network Devices > Flashcards

Chapter 7 - Network Devices Flashcards

1
Q

Firewalls

A

Can be software or hardware
Control access and egress of network traffic
Prevent in authorised access to a private network
Protects company network and data
Protects from intrusion and attack.

! It doesn’t prevent viruses or malware!

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2
Q

Software Firewall

A 
Host based
Runs on a PC or sever
Is configurable software
Since windows XP a software firewall included in the OS
Protects just the host
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3
Q

Hardware Firewall (Network)

A

Typically a device
Can run in a server
Segregated a LAN from devices on an untrusted network
Protects entire network

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4
Q

Packet Filtering

A

Accepts or rejects packets entering and leaving the network through configurable criteria.

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5
Q

Application Gateway

A

Applies security mechanisms to specific application

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6
Q

Circuit level gateway

A

Applies security mechanisms to TCP and UDP connections working on port numbers

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7
Q

Proxy server

A

Hides network addresses
Only exposes the public network to the internet
Can’t see used addresses of the private network

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8
Q

Routers

A

Lester 3 - Network Layer
Connects networks
Forwards packets to tiger networks based on IP address
Is a gateway device
Focuses on network port Hong of address
Connects LAN to WAN, LAN to LAN, LAN to ISP

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9
Q

Broadband router

A

Connects both computer together and to the internet

It perform as switching and routing (Layer 3 - Network switch)

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10
Q

Edge router

A

Placed on edge of your ISP

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11
Q

Subscriber edge router

A

Connects to ISP edge router

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12
Q

Core router

A

Inside of network and not connected to public internet

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13
Q

Hub

A 
Layer 1 physical device
Connects hosts or LAN segments
Broadcasts to all ports
All hosts or segments see the packets
Is not aware of addressing
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14
Q

Switch

A

Data link layer 2
Swear of addressing
Spends packets to a specific port by learning MAC Addresses
Prevents looping by supporting VLAN and spanning tree protocol (STP)
Improves bandwidth by not flooding network with in necessary traffic like a hub does

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15
Q

Ethernet Switch port parameters

A

1/ Interface speed, it can have auto negotiator speed sensing or manually set

2/ duplex

3/ Auto Media Dependant Interface Crossover (mdix)
Which enables a switch to re work a connection digitally to use a straight through cable where a cross over cable is needed

Normally wires 1 and 2 transmit and 3 and 6 receive

Auto sensing reduces changes needing to be made but requires more performance

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16
Q

Bridge

A 
Operates at data link layer 2
Joins two seperate network segments
Enables communications between segments using the same protocol
Uses MAC Address 
Can be used to extend a network

! Bridges don’t connect networks. They connect different portions of the same network.!

17
Q

Bridge additional functions not provided by a switch

A

Enables connection of dissimilar media and different network architecture.

Media - UPS and Fiber
Architecture- Token ring and Ethernet

18
Q

Bridge types

A

1/ Local Bridge
Directly connects segments of the same LAN

2/ Remote Bridge
Creates a WAN link between LANs using the same network address. (1 LAN in one building and a second in another building)

3/ Wireless Bridge
Provides wireless connectivity from Ethernet ports and can benefit devices if a bridge connects to a switch
Extends segment with wireless capability

  • They us a MAC Address Table which enables communication when needed while keeping traffic in segments segregated from other segments*
19
Q

Modems

A 
Enables computer to transmit data using phone lines
Is a modulator/demodulator device
RS-232 standard 
56kbos mx speed
Converts digital and analog information
  • Analog transmit over phone line
  • Modulation is converting from digital to analog
  • demodulate is concerting analog to digital
20
Q

Modem Types

A

1/ Hardware
Dial up modem where processing occurs in the modem

2/ Software
Lost cost
Easy to upgrade
Computer processes the data

21
Q

Wireless access point (WAP)

A

Used to provide a host with wireless connection
Extends wireless range
Acts like a bridge between wire and wireless networks
Can be a multi purpose device but single function devices are more efficient

They can!
Strengthen security as you need to know connection information and they extend wireless range.

22
Q

Rogue Access Point

A

In authorised access point that is connected to a company network which provides attackers with access to company LAN over wifi.

23
Q

Evil Twin

A

A phishing attack

Attacks sets up a legitimate looking access point using possibly a portable host to harvest data

24
Q

Media Converters

A

Adapter used to enable segments or networks using different media to connect and exchange signals.
Physical layer 1 device

They’re cost effective and flexible to use

Can convert multi mode fiber to single mode

Can convert electrical signals to light waves

Enables signal boost between devices

Some converters operate at Layer 2 data link

25
Q

Media converter characteristics

A

Help expand network distance
Implement Wave a length Division Multiplexing (WDM) to boost fiber performance
Retain investment into existing infrastructure

26
Q

Wireless range extender

A

Extends radio frequency range of wireless transmissions

Layer one physical device to extend Ethernet network

Simply passes on data traffic to extend

Allows devices to connect to a WLAN outside WAP normal range

Don’t place extender at very edge of WAP range as it won’t be a very strong signal. Have overlap.

27
Q

Distance from a wireless extender depends on?

A

1/ Transmitter Power
2/ Gain of antenna
3/ Clients transmitter and receiver

!you just stay within range of the extender!

28
Q

VoIP End Points

A

Is voice over IP Protocol

hardware and software needed to make use of internet as a transmission medium

29
Q

Voice Data

A

Sent using IP instead of Public Switched Telephone Network (PSTN)
Need to be signed into an application and configure as a contact

30
Q

VoIP Benefits

A

Cost saving

Media, Protocol and applications service

31
Q

Software base VoIP devices

A

Use direct VoIP data conversations where you can

Call switching and connection manage
Call recording and auto attend
Conference call
Translation language

32
Q

End points

A

Typically an IP Phone that’s TCP/IP aware and connected directly by data link

Plugged into an Ethernet switch it hub

10 or 100Base5 with auto negotiate interfaces

33
Q

Multiple end points

A

Assign server devices to ring upon receiving a call

Allows call answer from any geographical location

Networking + Self Made (8 decks)

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