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My COMPTIA A+ Core 1 > Networking > Flashcards

Networking Flashcards

1
Q

Patch panel

A

What to look out for
- Device that allows cable network jacks from a wall into a central area
- Computers are connected to wall jacks in this system, and connected to patch panel by cables, running in the walls
- Pre-wired, RJ 45 port on the switch using a switch through or patch cable

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2
Q

WAP

A

Wireless access point

What to look out for
- Device that allows wireless devices to connect to a wired network
- Connect directly to a wired LAN or local area network then the WAP provides wireless connections using Wi-Fi for other devices to use that wired connection
- supports multiple wireless devices through their wired connection
- should always be configured with channels 1, 6, and 11 to maximize distance between channels and prevent overlaps

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3
Q

Hub

A

Would you look out for?
- Whatever is received on one port is repeated out every other port
- Has several different ports between 4 and 48 po

Benefits

Cons
- Leads to collisions
- increases in the number of re-broadcasts which slows down the entire network

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4
Q

Static IP

A

What to look out for
- Manually input, IP address, subnet Mask, gateway, and DNS( domain name server or domain names system)
- used to ensure servers are easy to find
- used when DHCP is disabled

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5
Q

Dynamic IP

A

Would you look out for?
- Automatically assigned using DHCP

Benefits

Cons

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6
Q

APIPA address

Windows-based

Autom…

A

Automatic, private, IP, addressing (also called Link local address)

What to look out for
- windows-based operating systems feature
- 169.254.0.0 to 169.254.255.255
D iscover
O ffer
R equest
A cknowledge
- Enables computer to automatically assign itself an IP address when DHCP is not available to perform the function
- it can communicate with other hosts on the same network using APIPA
- APIPA to APIPA only
- can’t reach host that have valid IP obtained by DHCP

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7
Q

VLAN

A

Virtual local area network

What to look out for
- can divide single switch into multiple networks
- only supported on managed switches
- Can communicate between different VLAN
- allows sub networks

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8
Q

VPN

A

Virtual private network

What to look out for
- Extends private network across public network
Enables users to send/receive data share or public networks as if connected to private network

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9
Q

DSL modem

A

Digital subscriber line

What to look out for
- used to connect computer or router to phone line which supplies Internet connections

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10
Q

Dynamic NAT

A

What to look out for
- Many-to-one mapping of private IP addresses or subnet masks inside a LAN or local area network inside to a public IP or subnet the local area

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11
Q

802.11AC ( Wi-Fi 5)

A

What to look out for
- 5 GHz frequency
- 6.9 Gbps
- Multiple user multiple input multiple output (MUMIMO
- channel bonding? (160MHZ)

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12
Q

802.11AX (Wi-Fi 6)

A

What to look out for
- 2.4 GHz and 5 GHz frequency
- 9.6 Gbps
- orthogonal frequency division multiple access

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13
Q

802.11a

A

What to look out for
- 5 GHz frequency
- 54 Mbps

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14
Q

802.11b

A

What to look out for
- 2.4 GHz frequency
- 11 Mbps

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15
Q

802.11g

A

What to look out for
- 2.4 GHz frequency
- 54 Mbps

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16
Q

802.11n

A

What to look out for
- 2.4 GHz and 5 GHz frequency
- 150 Mbps (2.4GHz)
- 600 Mbps (5GHz)
- multiple input multiple output (MIMO)
- channel bonding? (Combining 220 MHz channels to a single 40 MHz channel)

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17
Q

MX record

A

What to look out for
- Used for outgoing SMTP and incoming POP 3/IMAP traffic

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18
Q

CNAME

A

Canonical name (or alias name)

What to look out for
- associates, one domain name as an alias of another (EX: beta.diontraining.com -> www.diontraining.com

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19
Q

A record

A

What to look out for?
- associates domain name with IPv4

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20
Q

AAAA Record

A

What to look out for
- Associates domain name with IPv6

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21
Q

Files sharing server

A

What to look out for
- A server that is used to host and control access to shared files/folders

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22
Q

What channels prevent interference and ensure non-overlapping of channels

Big Grapes Need Axes

A
  • Channel 1, 6, and 11
  • this includes 802.11B, 802.11G, 802.11N, 802.11AX
  • utilizes 2.4 GHz (can only select 1 and 11 in the US)
  • increases reliability and throughput
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23
Q

Network tap

A

What to look out for
- create a physical connection to network
- send copy of every packet received to a monitoring device for capture and analysis

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24
Q

Wi-Fi analyzer

A

What to look out for
- determines signal strength, frequency, radio, frequency interference

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25
Q

Tone generator

A

What to look out for
- Connected to a wall jack
- send repeating signal over cable

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26
Q

Toner probe

A

What to look out for
- detects cables connected to wall jack by detecting signal sent by tone generators
- Must be near or touching cable to identify positively

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27
Q

Cable tester

A

What to look out for
- Provide detailed info on physical/electrical properties of
- Test, test and report cable
- cross talk, attenuation, noise, resistance, etc

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28
Q

5 GHz wireless frequency

A

what to look out for
- 5 GHz has more channels
- Supports higher data rates than 2.4 GHz
- Less congestion and interference than 2.4 GHz

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29
Q

2.4 GHz frequency

A

What to look out for
- Longer wavelength than. 5 GHz
- Better at penetrating services than 5 GHz
- longer range with same output levels
- each channel on the 2.4 GHz spectrum is 20 MHz wide

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30
Q

Intrusion prevention system

A

Intrusion prevention system (IPS)

What to look out
- network security that detects and prevents identified threats
- Intrusion prevention systems continuously monitor your network, looking for possible malicious incidents, and capturing information about them
- IPS can block malicious network traffic, unlike an IDS, which can only log them.

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31
Q

Proxy server

A

What to look out for
- a server application that acts as an intermediary between a client requesting a resource and the server providing that resource.

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32
Q

Syslog

A

System logging protocol

What to look
- port 514
- a way network devices can use a standard message format to communicate with a logging server.
- It was designed specifically to make it easy to monitor network devices.
- Devices can use a Syslog agent to send out notification messages under a wide range of specific conditions.

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33
Q

SSH

A

Secure shell

What to look out for
- is the protocol used for remote administration and file copying
- TCP port 22
- SSH is considered secure since it uses authenticated and encrypted sessions for communication.

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34
Q

FTP

A

File transfer protocol

What to look out for
- used to transfer files across the internet
- ports 20 and 21

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35
Q

HTTP

A

Hypertext transfer protocol

What to look out for
- used to provide web content to browsers
- port 80

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36
Q

Network Basic Input/Output System (NetBIOS) Ports

A

Ports 137, 139

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37
Q

Simple Network Management Protocol (SNMP) ports

A
  • TCP/IP
  • Ports 161, 162
  • Used to collect data about network devices and monitor
    their status
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38
Q

Lightweight Directory Access Protocol (LDAP)

A

Port 389

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39
Q

Server Message Block (SMB)

A

o Port 445
o Used for Windows file and printer sharing services

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40
Q

Remote Desktop Protocol (RDP)

A

o Port 3389
o Provides graphical remote control of another client or
server
o RDP provides a full graphical user interface

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41
Q

Virtual Network Computing (VNC)

A

Port 5900

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42
Q

PAN

A

Personal area network

What to look out for
- Close range network
- based on Bluetooth or near field communication (NFC) for communications between personal devices, such as smartphones, laptops, printers, and other peripheral devices.

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43
Q

CAN

A

Campus Area Network (CAN)
▪ Connects LANs that are building-centric across a university, industrial
park, or business park
● Up to a few miles

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44
Q

LAN

A

Local area network

What to look out for
- is a network where all the nodes or hosts participating in the network are directly connected with cables or short-range wireless media.
- Connects components within a limited distance
● Up to a few hundred feet

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45
Q

WAN

A

Wide area network

What to look out for
- Spans multiple geographic locations
- Often established with leased telecommunications (Telecom) circuits
- Worldwide coverage

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46
Q

SAN

A

Storage area network

What to look out for
- Dedicated independent high-speed network
- Interconnect and delivers shared pools of storage devices to multiple servers
- Often uses fiber channel over ethernet (FCOE), fiber, channel, or Internet small computer systems interface (ISCSI) to achieve the speeds necessary to support SAN operations.

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47
Q

WLAN

A

Wireless local area network

What to look out for
- Connect computers within a small and specific geographical area using 802.11 protocols for their wireless connecting
- A wireless distribution method for two or more devices that creates a
local area network using wireless frequencies

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48
Q

MAN

A

Metropolitan area network

What to look out for
- Computer network that interconnects users within computer resources in a region, the size of a metropolitan area or city

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49
Q

Legacy system

A

What to look out for
- A legacy system is no longer directly supported by its vendor
- Legacy systems usually work well for what they do (which is why they don’t get prioritized for replacement), but they represent very severe risks in terms of security vulnerabilities.
- Networks often need to retain hosts running DOS or legacy versions of Windows (8.1 and earlier) or old-style mainframe computers to run services that are too complex or expensive to migrate to a more modern platform.
- The most convenient and least expensive way to connect older devices would be to buy an adapter

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50
Q

UTM

A

Unified threat management

What to look out for
- are network appliances that provide all the security functions of a firewall, malware scanner, intrusion detection, vulnerability scanner, data loss prevention, content filtering, and other security devices into a single device or appliance.
Advantages
- Reduced # of devices
- Lower costs
- Easier to install
Disadvantages
- Single point of failure
- Lacks detail provided by a
specialized tool
- Performance is not as effieient as single function devices

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51
Q

Patch systems

A

What to look out for
- used to conduct patch management across your organization’s network.

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52
Q

Embedded system

A

What to look out for

  • is a computer system that is designed to perform a specific, dedicated function, such as a microcontroller in a medical drip or components in a control system managing a water treatment plant.
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53
Q

POE

A

Power over ethernet

What to look out for
- Power over Ethernet (POE) provide power over ordinary data cabling to devices such as VoIP handsets and wireless access points
- PoE can support up to 15.4W
- 802.3af (PoE)
- 15.4W of power at distance of up to 100m.
- PoE can support low-powered devices such as VoIP handsets.

54
Q

PoE+

A

Power over ethernet +

What’s to look out for?
- Can support up to 25W
- 802.3at (PoE+) standard can support up to 25W of power at a distance of up to 100 meters
- PoE+ can support higher-powered devices such as PTZ cameras, door controllers, and thin client computers

55
Q

Switches

A

▪ Smart hubs that remember the ports that are connected to them
● Switches can have multiple people talking at one time
o Unmanaged Switch
▪ Performs its functions without requiring a configuration
o Managed Switch
▪ Performs its functions with configuration

56
Q

Firewall

A

Scans and blocks traffic that enters or leaves a network
● Unified threat management (UTM) contains firewall features
- Packet-filtering
● Stateful
● Proxy
● Dynamic packet-filtering
● Kernel proxy

57
Q

Optical Network Terminal (ONT)

A

Terminates fiber connection

58
Q

Small Office, Home Office (SoHo) LAN

A

Uses a centralized server or simply provides clients access to local
devices like printers, file storage, or the Internet

59
Q

Twisted Pair Cables

A

o STP (Shielded) and UTP (Unshielded) operate about the same
o Keep cable runs under 70 meters from the IDF to the office

60
Q

Single Mode Fiber (SMF)

A

▪ Used for longer distances and has smaller core size which allows for only
a single mode of travel for the light signal
- More expensive
● SMF’s core size is 8.3-10µ in diameter

61
Q

Multimode Fiber (MMF)

A

Used for shorter distances and has larger core size which allows for
multiple modes of travel for the light signal
- Lager core size
- Covers shorter distances
- less expensive
● MMF’s core size is 50-100µ in diameter
● Up to 2 kilometers or less

62
Q

Fiber Optic Cable

A

Uses light from an LED or laser to transmit information through a thin
glass fiber
● Greater usable range
● Greater data capacity
- Switches, routers, and end-user devices can become a limitation

63
Q

Coaxial Cabling

A

Coaxial Cable (Coax)
▪ One of the oldest categories of copper media that is still used in
networking today

64
Q

Cable Stripper

A

Used to strip off the end of the cable and prepare it for attachment to a
connector

65
Q

Cable Crimper

A

Used to attach the connector to the end of the cable

66
Q

Punch-Down Block

A

Terminates the wires and strips off excess installation and extra wires
that are no longer needed

67
Q

Wi-Fi (802.11)

A

Creates point to point connections from one building to another over a
relatively short distance

68
Q

Cellular

A

Uses a larger antenna and a larger hotspot powered by a power outlet
within an office or home

69
Q

Microwave

A

▪ Creates point to point connection between two or more buildings that
have longer distances
▪ A traditional microwave link can cover about 40 miles of distance
- UHF, SHF, and EHF

70
Q

Satellite

A

A long range and fixed wireless solution that can go for miles
● Slow
● Expensive
● High latency

71
Q

Radio Frequency dentification (RFID)

A

A form of radio frequency transmission modified for use in authentication
systems

72
Q

Cellular Connections

A

1G: 30 KHz - 2 Kbps
2G: 1800 MHz - 14.4 Kbps to 2 Mbps
3G: 1.6 to 2 GHz - 144Kbps to 2 Mbps
4G: 2 to 8 GHz - 100 Mbps o 1 Gbps
5G
- Low band: 600-850 MHZ (30-250 Mbps)
- Mid band: 2.5-3.7 GHz (100-900 Mbps)
- High band: 25-39 GHz (Extremely high speed (In Gbps)

73
Q

TCP

A
  • Transmission Control Protocol
  • Reliable (Threeway handshake)
  • Connection oriented
  • Segment retransmission and flow control (Windowing)
  • With segmentation of sequencing
  • Acknowledgement
74
Q

Network Interface Card (NIC)

A

Provides an ethernet connection to the network

75
Q

Internet of Things

A

▪ A global network of appliances and personal devices that have been
equipped with sensors, software, and network connectivity to report
state and configuration
● Segregation of IoT devices is critically important for the business
network’s securit

76
Q

Bandwidth

A

The theoretical measure of how much data could be transferred from a
source to its destination

77
Q

Throughput

A

The actual measure of how much data is successfully transferred from a
source to its destination

78
Q

568b

A

The standard that’s preferred when wiring jacks inside of buildings

79
Q

MDIX

A

A medium dependent interface crossover (MDIX) is an automated way to
electronically simulate using a crossover cable

80
Q

Wire Mapping Tool

A

Works like a cable tester, but specifically for twisted pair ethernet cables

81
Q

Pre-Shared Key

A

▪ Both the access point and the client use the same encryption key
▪ It’s not a good idea to use pre-shared keys in large environments

82
Q

Wired Equivalent Privacy (WEP)

A

Original 802.11 wireless security standard which is an insecure security
protocol
▪ WEP uses 24-bit Initialization Vector (IV) sent in clear text

83
Q

Wi-Fi Protected Access (WPA)

A

▪ Replaced WEP and follows the Temporal Key Integrity Protocol (TKIP)
▪ WPA uses 48-bit Initialization Vector (IV) instead of 24-bit
● Rivest Cipher 4 (RC4)
● Message Integrity Check (MIC)
● Enterprise Mode

84
Q

Wi-Fi Protected Access 2 (WPA2)

A
  • requires stronger encryption
    and integrity checking through CCMP
    ● Advanced Encryption Standard (AES)
    ● Personal Mode
    ● Enterprise Mode
85
Q

Cable Modems

A

Uses a cable TV network that is made up of a hybrid fiber-coaxial (HFC) distribution network

86
Q

Data-Over-Cable Service Interface Specifications (DOCSIS)

A

▪ Specific frequency ranges used for upstream and downstream
transmissions
● Upstream
o 5 MHz to 42 MHz
● Downstream
o 50 MHz to 860 MHz

87
Q

Fiber To The Curb (FTTC)

A

Runs a fiber optic cable from an internet provider access point to a curb

88
Q

Fiber To The Premises (FTTP)

A

Fiber optic that connects directly to a building and connects to an optical
network terminal (ONT)

89
Q

Optical Network Terminal (ONT)

A

Physical devices that convert optical signals to electrical signals

90
Q

Link/Network Interface Layer

A

In the link/network interface layer, the data can only travel through the
local area network

91
Q

Internet Layer

A

Used to address packets and route them across the network

92
Q

Transport Layer

A

Shows how to send the packets
● TCP
o Transmission Control Protocol
● UDP
o User Datagram Protocol

93
Q

Application Layer

A

Contains all the protocols that perform higher-level functions

94
Q

7 layers of the OSI Model

A

All: Application (Layer 7)
People: Presentation (Layer 6)
Seem: Session (Layer 5)
To: Transport (Layer 4)
Need: Network (Layer 3)
Data: Data Link (Layer 2)
Processing: Physical (Layer 1)

95
Q

Loopback Address (127.0.0.1)

A

Creates a loopback to the host and is often used in troubleshooting and
testing network protocols on a system

96
Q

Domain Name System (DNS)

A

▪ Converts the domain names used by a website to the IP address of its
server
▪ DNS is the internet version of a phone book

97
Q

Bootstrap Protocol (BOOTP)

A

Dynamically assigns IP addresses and allows a workstation to load a copy
of boot image to the network

98
Q

Dynamic Host Control Protocol (DHCP)

A
  • Provides an IP address to every machine on the network and eliminates
    configuration errors
    192.168.1.100 through 192.168.1.200
  • Ports 67, 68
  • Each IP is leased for a period of time and returns to the pool when
    the lease expires
99
Q

MX (Mail Exchange)

A

Directs emails to a mail server

100
Q

TXT

A

Adds texts into th DNS

101
Q

NS (Name Server)

A

Indicates which DNS nameserver has the authority

102
Q

Full Tunnel VPN

A

Routes and encrypts all network requests through the VPN connection
back to the headquarters

103
Q

Split Tunnel VPN

A

Routes and encrypts only the traffic bound for the headquarters over the
VPN, and sends the rest of the traffic to the regular Internet

104
Q

Secure Socket Layer (SSL)

A

Provides cryptography and reliability using the upper layers of the OSI model (Layers 5, 6, and 7)

105
Q

Transport Layer Security (TLS)

A

▪ Provides secure web browsing over HTTPS

106
Q

Globally Routed

A

Like IPv4’s unicast class A, B, and C addresses
and begins with 2000-3999

107
Q

Link-Local/Local Use

A

Used like a private IP in IPv4 that can only be used on the
local area network and begins with FE80

108
Q

Stateless Address Autoconfiguration (SLAAC)

A

Eliminates the need to obtain addresses or other configuration
information from a central server

109
Q

Multicast Address

A

Used to identify a set of interfaces and begins with FF

110
Q

Anycast Address

A

Used to identify a set of interfaces so that a packet can be sent to any member of a set

111
Q

Extended Unique Identifier (EUI)

A

Allows a host to assign itself a unique 64-bit IPv6 interface identifier
called EUI-64

112
Q

Port

A

▪ Logical communication endpoint that exists on a computer or server
- Ports can be any number between 0 and 65,535

113
Q

Well-Known Ports

A

Ports 0 to 1023 are considered well-known and are assigned by the Internet Assigned Numbers Authority (IANA)

114
Q

Registered Ports

A

Ports 1024 to 49151

115
Q

Trivial File Transfer Protocol (TFTP)

A

● Ports 69
● a connectionless protocol that uses UDP as its transport

116
Q

Remote Authentication Dial-In User Service (RADIUS)

A

Provides centralized administration of dial-up, VPN, and wireless
authentication services for 802.1x and the EAP
- Relies on UDP
- Combines authentication and authorization
- Does not support all network protocols
- has cross-platform capability
RADIUS operates at the application layer

117
Q

Terminal Access Controller Access-Control System Plus (TACACS+)

A

Proprietary version of RADIUS that can perform the role of an
authenticator in 802.1x networks
- Relies on TCP
- Separates authentication, authorization, and accountinh processes
- Supports all network protocols
- Exclusive to Cisco devices

118
Q

Authorization

A

▪ Occurs when a user is given access to a certain piece of data or certain
areas of a building

119
Q

Kerberos

A

Authentication protocol used by Windows to provide for two-way
(mutual) authentication using a system of tickets

120
Q

Accounting

A

Ensures the tracking of data, computer usage, and network resources is
maintained

121
Q

Telnet

A

Port 23

122
Q

Terminal Emulator (TTY)

A

▪ Any kind of software that replicates the TTY I/O functionality to remotely
connect to a device
▪ TTY is the terminal or end point of the communication between the
computer and the end-user

123
Q

Managed Devices

A

Computers and other network-attached devices monitored using agents
by a network management system

124
Q

Load Balancer/ Content Switch

A

▪ Distributes incoming requests across several servers inside a server farm
or a cloud infrastructure
▪ A load balancer is one of the key things to help defend against a DoS
attack or a DDoS attack

125
Q

Industrial Control System (ICS)

A

▪ Provides the mechanisms for workflow and process automation by
controlling machinery using embedded devices
▪ Multiple ICSs can create a distributed control system (DCS)

126
Q

Supervisory Control and Data Acquisition (SCADA)

A

▪ Type of ICS used to manage large scale multi-site devices and equipment
in a geographic region from a host computer

127
Q

CAT5

A
  • 100 Mbps
    • 100Base-TX(Twisted pair)
  • 100m
128
Q

CAT5e (Gigabit Ethernet)

A
  • 1000base-T
  • 1000 Mbps (1Gb)
  • 100m
129
Q

CAT6

A
  • 1000 Base-T
  • 1000 Mbps
  • 100m
    or
  • 10G Base-T
  • 10 Gbps
  • 55m
130
Q

CAT6a

A
  • 10G Base-T
  • 10 Gbps
  • 100m
131
Q

CAT7

A
  • 10G Base-T
  • 10 Gbps
  • 100m
132
Q

CAT8

A
  • 40G Base-T
  • 40 Gbps
  • 30m

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