Messer - Section 2 Flashcards
IP Data Transmission as “Moving Vans”:
- Road
- Van
- Cargo Area
- Boxes
Road - Ethernet, DSL, or Cable
Van - Internet Protocol
Cargo Area - OSI Layer 4 Encapsulating and Multiplexing TCP and UDP
Boxes - TCP and UDP
TCP
Transmission Control Protocol
- Connection-oriented, formal setup and close
- “Reliable” Delivery
- Receiver can manage data sent
UDP
User Datagram Protocol
- Connectionless, no formal open or close
- “Unreliable” Delivery
- Sender determines amount of data transmitted
IP Data Transmission between “Houses”
- Moving Van
- Origin House
- Destination House
- Rooms
Moving Van - Move TCP/UDP along “road”
Origin - Origin IP address
Destination - Destination IP address
Rooms - TCP/UDP “box” is dropped in correct port
Non-ephemeral ports
Permanent port numbers
Ports 0 - 1023
Usually on a server or service
Ephemeral ports
Temporary port numbers
Ports 1024 - 65,535
Determined in real-time by the client
FTP
File Transfer Protocol
Sends and receives files between systems
tcp/20, tcp/21
SSH
Secure Shell
Encrypted console access
tcp/22
Telnet
Telecommunication Network
Insecure console access
tcp/23
SMTP
Simple Mail Transfer Protocol
Transfer email between mail servers
tcp/25
DNS
Domain Name System
Convert domain names to IP addresses
udp/53, tcp/53
HTTP
Hypertext Transfer Protocol
Web server communication
tcp/80
HTTPS
Hypertext Transfer Protocol Secure
Web server communication with encryption
tcp/443
POP3
Post Office Protocol Version 3
Receive email into an email client
tcp/110
IMAP4
Internet Message Access Protocol Version 4
A newer email client protocol
tcp/143
RDP
Remote Desktop Protocol
Graphical display of remote devices
tcp/3389
NetBIOS Name Service
NetBIOS Name Service
Register, remove, and find Windows services by name
udp/137
NetBIOS Datagram Service
NetBIOS Datagram Service
Windows connectionless data transfer
udp/138
NetBIOS Session Service
NetBIOS Session Service
Windows connection-oriented data transfer
tcp/139
SMB
Server Message Block
Windows file transfers and printer sharing
tcp/445
AFP
Apple Filing Protocol
Mac OS file transfers
tcp/548
SLP
Service Location Protocol
Find Mac OS services by name
tcp/427, udp/427
DHCP
Dynamic Host Configuration Protocol
Automate the IP address configuration process
udp/67, udp/68
LDAP
Lightweight Directory Access Protocol
Directory services
tcp/389
SNMP
Simple Network Management Protocol
Gather metrics and manage network devices
udp/161
802.11a
5 GHz Streams N/A Max throughput/stream = 54 Mbit/s Max throughput/total = 54 Mbit/s 20 MHz bandwidths
802.11b
2.4 GHz Streams N/A Max throughput/stream = 11 Mbit/s Max throughput/total = 11 Mbit/s 22 MHz bandwidths
802.11g
2.4GHz Streams N/A Max throughput/stream = 54 Mbit/s Max throughput/total = 54 Mbit/s 20 MHz bandwidths
802.11n
5 GHz and/or 2.4 GHz
4 MIMO Streams
Max throughput/stream = 150 Mbit/s
Max throughput/total = 600 Mbit/s
20 or 40 MHz (2 contiguous 20 MHz bonded channels)
In 2.4 GHz, a 40 MHz channel uses much of bandwidth
802.11ac
5 GHz 8 MIMO Streams Max throughput/stream = 866.7 Mbit/s Max throughput/total = 6.8 Gbit/s 40 MHz for 802.11n stations 80 MHz required for 802.11ac stations 160 MHz optional (contiguous channels or non-contiguous bonded channels)
How many bits long is a NIC physical address
48
MAC
Media Access Control
A device’s physical address
POE
Power Over Ethernet
PLC
Power Line Communication
Allows network devices such as SOHO routers to be automatically configured, sometimes referred to as needing “zero configuration”.
Wifi Protected Setup (WPS)
Allows you to access a computer on your internal network from a computer on the internet.
Port forwarding
Change the priority of network traffic, such as giving a higher priority to one type of traffic over another. Also known as “Throttling”.
Quality of Service (QoS)
Limits which devices can access your wireless network by specifying the MAC addresses that are allowed to connect to the network.
MAC filtering
To avoid interference from nearby wireless networks, you can change this setting on your wireless network so that it uses a unique frequency.
Dynamic Frequency Selection (DFS)
RFID
Radio Frequency Identification
NFC
Near Field Communication
What is the IEEE spec number that standardized Zigbee?
802.15.4 PAN
Which has the longer transmission distance: Zigbee or Z-Wave
Z-Wave
Z-Wave operate a the ___ MHz range.
915
System prevents intrusions from accessing network
Intrusion Prevention System (IPS)
Server that stores and sends emails
Email server
Server that automatically assigns IP addresses to hosts on a network
Dynamic Host Control Protocol server (DHCP)
Server that accepts logons from users and allows/disallows access to network resources based on the permissions assigned to each user.
Authentication server
Server that responds to browser requests using protocols such as HTML
Web server
Centralized server used to store documents that users can access.
File server
Intermediate server that sits between you and some 3rd party resource such as the Internet.
Proxy server
Server used to manage all network hosts from a single location.
Endpoint Management server
Server that uses protocols such as IPP, LPD and SMB to provide printing services for host on a network.
Printer server
Single device that combines multiple security features such as firewall, URL filtering, content inspection, malware inspection, IDS/IPS, router, switch, etc.
All in one appliance
Server that converts domain names to IP addresses
Domain Name Servier (DNS)
System that detects intrusions that have occurred on a network by triggering an alert or alarm.
Intrusion Detection System (IDS)
System that is considered older technology.
Legacy
Systems that are not the normal operating system you work with, but still have connectivity to the network and must be managed.
Embedded
Server that acts as a central logging receiver, gathering logging data from network devices
Syslog
Server roles used to provide access to the LAN and internet.
DNS, DHCP, Proxy
Resolves a friendly name to an IP address
DNS
Automatically assigns IP addresses to clients
DHCP
Reserves a specific IP address for a networking device
DHCP
Provides the IP address of the mail server in your domain
DNS
Keeps track of IP addresses for .com, .gov, .org, etc.
DNS
Processes discover requests and provides an offer
DHCP
Logically separates computers into multiple broadcast domains
VLAN
Used by teleworkers to seamlessly connect to their company’s internal network
VPN
A 128-bit IP address
IPv6
A 32-bit IP address
IPv4
Translates multiple private IP addresses into a single public IP address
NAT
A computer automatically assigned an address beginning with 169.254. What acronym describes this address and why was it assigned
APIPA (Automatic Private IP Addressing)
DHCP is down.
DHCP Process
Discover, Offer, Request, Acknowledge
How do you test the local loopback IPv6 address?
::1
WMN
Wireless Mesh Network
What is one thing to keep in mind when measuring resistance with a multimeter?
Make sure no current is flowing through the circuit.
Which tool can help determine where a break exists in a given cable run?
Time Domain Reflectometer