WGU C172 Network and Security Foundations.docx

TCP/IP (Transmission Control Protocol/Internet Protocol) - correct answer A set of protocols made up of four layers (Application, Transport, Network, Network Interface Layer) used to connect network devices to each other Network Interface Layer (TCP/IP) - correct answer TCP/IP model layer that establishes how data should be physically sent through the network. Ethernet In conjunction with layers 1 PHYSICAL and 2 DATA LINK Network Layer (TCP/IP) - correct answer TCP/IP model layer that defines the logical transmission protocols for the whole network. - IP ( Internet Protocol) - ARP ( Address Resolution Protocol) - ICMP (Internet Contol Message Protocol) - IGMP in conjunction with layer 3 NETWORK of the OSI Model. Transport Layer (TCP/IP) - correct answer TCP/IP model layer that s responsible for the end-to-end transport of data. The protocols that live in this layer are. - TCP (Transmission Control Protocol) - UDP (User Datagram Protocol) In conjunction with layer 4 TRANSPORT of the OSI Model Application Layer (TCP/IP) - correct answer TCP/IP model layer that is responsible for the communication protocols between nodes. The protocols in this layer include. - HTTP (Hyper Text Transfer Protocol) - SSH (Secure Shell) - FTTP - Telnet - NTP (Network Time Protocol) - DHCP - PING In conjunction with Layers 5 SESSION, 6 PRESENTATION, AND 7 APPLICATION of the OSI model. Physical Layer (OSI model) - correct answer Layer 1 of the OSI Model 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 (OSI Model) - correct answer Layer 2 of the OSI Model 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 (OSI Model) - correct answer Layer 3 of the OSI Model 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 (OSI Model) - correct answer Layer 4 of the OSI Model provides services to the application layer and receives services from the network layer and is responsible for the reliable delivery of data. It segments and reassembles data in the correct order for it to be sent to the receiving device. It may also handle the reliable delivery of data and any retries of data that are lost or corrupted (for example, TCP does this). This layer is often called the heart of OSI. Session Layer (OSI Model) - correct answer Layer 5 of the OSI Model responsible for connection establishment, session maintenance, and authentication. Presentation Layer (OSI Model) - correct answer Layer 6 of the OSI Model 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 (OSI model) - correct answer Layer 7 of the OSI Model responsible for network applications (like HTTP or FTP) and their production of data to be transferred over the network. Modem - correct answer A device that is necessary for sending and receiving data. They allow computers to transport digital information over analog lines such as phone or cable lines. The three types of these devices include cable, DSL, and satellite. They operate at Level 1 and 2 of the OSI Model Router - correct answer A device that serves as the point connection between two or more networks that forwards data packets between the networks. Operates at level 3 of the OSI Model. Switch - correct answer A device used to connect devices in a specific network and allows them to communicate efficiently withn the network. This device is a more complex version of a hub as they have the capability to add security measures and function more intelligently , sending traffic directly from the sender to the reciever without the other devices being aware. LAN Operates at level 2 and 3 of OSI Model Bridge - correct answer Similar to a router in that it connects two or more networks. The difference is that this device forwards data to the next network without analysis. These devices are not widely used in modern networks as routers and switches are the favored devices. Operates at Layer 2 of the OSI Model Repeater - correct answer A device used to strengthen, replicate, and regenerate signals that are weakened, for example becasue of distance. A range extender is a form of this device that takes the distorted WiFi signal and transmits it to the formerly dead zone, Operates at layer 1 of the OSI model Hub - correct answer A device that connects the router to the network, takes the data packets from the router and sends them to all the devices connected on the network. By connecting this device to your computer , data packets are able to be transferred to multiple devices connected to your computer, each device then looks at only the traffic destined for it and ignores the rest. Operates at Layer 1 of te OSI model Unshielded Twisted Pair (UTP) - correct answer Invented by Alexander Graham Bell in 1881 this type of cabling is created when pair o wires are twisted around each other to protect and cancel out interference from each other and outside sources. Cat3 cable - correct answer UTP that supports up to 10 MBPS for up to 100 meters and is commonly used for phone lines today CAT4 cable - correct answer UTP cabling that supports 16 Mbps for up to 100 meters and is not commonly used today Cat5 Cable - correct answer UTP cabling used in Ethernet LANs containing two twisted pairs allowing for up to 100 Mbps up to 100 meters between the device and the switch, hub, or router. This has been practically replaced by the Cat5e specification Cat5e - correct answer UTP cabling that doubles the number of twisted pairs to four for up to 1 Gbps (Gigabits per second) over up to 100 meters Cat6 - correct answer UTP cabling used in Ethernet LANs and data centers. made up of four tightly woven twisted pairs (more twists per linear foot) and supports 1 Gbps for up to 100 meters or 10 Gbps for up to 55 meters. Cat6a - correct answer UTP cabling that is an improvement of the Cat6 standard, supporting the same standards 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. RJ11 - correct answer A connector that supports two pairs of wires (four total); typically used in telephone RJ45 - correct answer This is an end connector typically used with Ethernet cables and supports four pairs (eight wires) Coaxial Cable - correct answer A single copper wire surrounded by layers of plastic insulation and sheathing; used mainly in cable television and cable Internet service. Fiber Cable - correct answer a glass tube and allows photons of light to be shot through cable. The fastest form of wired cabling ST Connectors- Straight Tip - correct answer The most commonly used connector with multimode fiber used until the mid 200s