Network and Security- Foundations- D315

Network and Security- Foundations- D315 Leave the first rating Students also studied Terms in this set (156) Western Governors UniversityIT C182 Save

WGU D315 - PRE-ASSESSMENT: NET...

205 terms Mira_PakPreview WGU D315 Network and Security Fo...70 terms drbeesaPreview Network and Security- Foundations...162 terms MsSerenity92 Preview WGU C 233 term kam TCP/IPTransmission Control Protocol/Internet Protocol Network interface LayerThis layer establishes how data should be physically sent through the network.OSI ModelOpen Systems Interconnection Model Physical Layer (Layer 1)This layer is responsible for the physical connections of the devices in the network. This layer is implemented through the use of devices such as hubs, repeaters, modem devices, and physical cabling.Data Link Layer (Layer 2)This layer is responsible for the error-free delivery of data to the receiving device or node. This layer is implemented through the use of devices such as switches and bridge devices, as well as anything with a network interface, like wireless or wired network cards.Network Layer (Layer 3)This layer is responsible for the transmission of data between hosts in different networks as well as routing of data packets. This layer is implemented through the use of devices such as routers and some switches.Transport layer (layer 4)In this layer protocols ensure that data are transferred from point A to point B reliably and without errors. this layer services include flow control, acknowledgment, error correction, segmentation, reassembly, and sequencing.Session Layer (Layer 5)This layer is responsible for connection establishment, session maintenance, and authentication.

Presentation Layer (Layer 6)This layer is responsible for translating data from the application layer into the format required to transmit the data over the network as well as encrypting the data for security if encryption is used.Application Layer (Layer 7)This layer is responsible for network applications (like HTTP or FTP) and their production of data to be transferred over the network.Hub {Physical Layer}-The simplest device used on an Ethernet network for connecting devices to each other -split the bandwidth of a connection among all the computers connected to it

• do not perform any packet filtering or addressing functions but instead

broadcast data to all computers connected to it Switch {Data and Network Layer}-Provides connectivity to devices in a local network -Creates a dedicated full-speed connection between two computers that are communicating with each other

• makes use of the MAC address to deliver the message to the right destination

Router{Network Layer}-Interconnect two or more networks -Operate at the border of your network -Stores information about the systems that are connected to it and where to send requests when the destination is unknown -Works at the network layer of the OSI model Wireless Access point {WAP}-Extends a wired network to wireless connections -Involves the IEEE 802.11 group of standards that defines wireless LAN's {WLAN's} -Central connecting point for computers equipped with wireless network adapters

• identifies each computer by its MAC address

Patch Panel-A box designed as a junction point for twisted pair (TP) cable and fiber cable used in networks.-First step in organizing your cables Firewall-A security hardware appliance or software application that protects a computer or network from unwanted intrusion -Blocks unwanted connections from untrusted networks and can block basic network attacks

Modem {Physical and Data link Layer}-Connects a LAN to an internet service provider -Converts digital signals into analog signals and vice versa Network Interface Card (NIC) {Physical Layer}-The interface on a computer or other device that connects to the LAN -Designed to take the communication off the physical cable or wireless signal and present it to the computer for processing -Each one has a unique physical address known as a MAC address Bridge {Data link Layer}Connects two or more networks Forwards data to next network with analysis Not widely used in modern networks Repeater{Physical Layer}Amplifies that signal it receives so that it can travel a longer distance unsheilded twisted pair (UTP)are created when pairs of wires are tested around each other to protect and cancel out interference from each other and outside sources.Cat 3 cableSupports up to 10 Mbps {megabits per second} for up to 100 meters and is commonly used for phone lines today CAT 4 CableSupports 16 Mbps for up to 100 meters and is not commonly used today CAT-5 CableUsed in Ethernet LAN's containing two twisted pairs, allowing for up to 100 Mbps up to 100 meters between the devices and the switch, hub, or router. This has been practically replaced by the cat 5e specification Cat 5e cableDoubles the number of twisted pairs to four for up to 1 Gbps {gigabits per second} over up to 100 meters Cat 6 cableUsed in Ethernet LAN's and data centers, is made up of four woven twisted pairs {more twisted per linear foot} and supports 1 Gbps for up to 100 meters or 10 Gbps for up to 55 meters Cat 6a cableAn improvement of the cable Cat 6 standard, supporting the same standard and lengths, {with the ability to run 10 Gbps over 100 meters maximum}, but using a higher quality cable that is more resistant to interference. This is most commonly used in wired networks today fiber-optic cableCable that uses light guided through thin glass tubes instead of electrical signals to transmit data. It is very fast, but also expensive.Single-mode fiberHave several thin glass strands { in rare cases, plastic} covered protective insulation. have thin 10-micron strands and support a narrow range of wavelengths and higher bandwidth, making them ideal for submarine cabling across continents

Multi-mode fiberMuch cheaper than single-mode across shorter distances. The fiber in these cables is thicker, from 50 to 100 microns. Because of their thickness, they can run a wider frequency of light over shorter distances, from a couple of thousand meters to a couple of miles.Coaxial cableA single copper wire surrounded by layers of plastic insulation and sheathing is used mainly in cable television and cable Internet service.Ping commandTools for testing connectivity to other hosts Sends internet control message protocol {ICMP} to a host and listens for the reply Replies displays time it took and time to live {TTL} Traceroute/Tracert commandTrace the route an IP packet takes to it's destination Display each hop {next router} with its IP address and the time it takes to receive the packet Traceroute is linux command { can only be used by super user} Tracert is windows command tracepath commandSimilar to traceroute/tracert Display the path taken by packet to its destination Used in linux { any user can use} ipconfigProvides the user with the IP, subnet mask, and default gateway for each network adapter With/all can display MAC address, DHCP status and lease information Used in windows ifconfigSimilar to ipconfig Used to configure the network interface Used in linux ARPAddress Resolution Protocol Displays the MAC address mapping for the hosts that have been discovered in the ARP cache netstatDisplays information about active ports and their state Useful for troubleshooting