Network and Security Foundations - D315 Questions and Answers with complete

model that is a common set of protocol standards that permits the appropriate transmission of data; used for practical application when locating specific protocol - Answer-TCP/IP application, transport, network, network interface - Answer-TCP/IP layers model that enables transmission of data among hosts on a network; widely used in network documentation and discussions - Answer-OSI Application, Presentation, Session, Transport, Network, Data Link, Physical - Answer-OSI layers OSI acronym - Answer-Open Systems Interconnection (OSI) set of procedures that sends data from one host to another. Can be done over the internet, network, or any form of communication - Answer-TCP and OSI Physical cabling and wireless spectrum - Answer-TCP Network Interface Layer cables and connectors; establishes how a signal is transmitted via wires or airwaves; responsible for the physical connections of the devices in a network; use hubs, repeaters, modem devices and cabling - Answer-OSI - Physical Layer contains network card and Media Access Control (MAC) address; responsible for error-free delivery of data to the receiving device or node; switches, bridges, or wireless/wired network cards - AnswerOSI - Data link layer Internet Protocol and Internet Control Message Protocol (ICMP); define one protocol versus another for connecting networks - Answer-Network Layer (TCP and OSI) ensures data is transferred to the correct application; Transmission Control Protocol (TCP) or User Diagram Protocol (UDP) - Answer-Transport Layer (TCP and OSI)type of transport layer; verifies data and resends if not delivered - Answer-Transmission Control Protocol (TCP) type of transport layer; unreliable to the extent that it does not guarantee redelivery of the data; preferred in audio streaming - Answer-User Diagram Protocol (UDP) HTTP for a web broswer; SMTP for email; DNS; Secure Shell (SSH); network time protocol (NTP); communication protocol between nodes - Answer-TCP - Application Layer establishes the session and ensures things are working correctly end-to-end - Answer-OSI - Session Layer takes care of data encryption; translating data from the application layer into format required to transmit data; - Answer-OSI - Presentation Layer HTTP; DNS; File transfer protocol (FTP); responsible for network application; production of data to be transferred over the network - Answer-OSI - Application Layer Physical 1; Data Link 2; Network 3; Transport 4; Session 5; Presentation 6; Application 7 - Answer-OSI layers by number responsible for end-to-end transport data; TCP and UDP - Answer-TCP Transport Layer logical transmission protocols for the whole network; IP, Internet Control Message Protocol (ICMP), address resolution protocol (ARP) - Answer-TCP Network Layer establishes how the data should be physically sent through the network - Answer-TCP Network Interface Layer responsible for the transmission of data between hosts in different networks as well as routing data packets; use routers and some switches - Answer-OSI - Network Layer receives services from network layer and provides services to the application layer; responsible for reliable delivery of data; segments and reassembles data in the correct order for it to be sent to the receiving device; handle reliable delivery of data that are lost or corrupted (TCP does this); heart of OSI - Answer-OSI - Transport Layerfound with OSI data link; standalone or integrated with other devices; keeps traffic between the source and destination ports from interfering with other devices on the network; - Answer-Switch found with OSI network layer; connect home network to the internet; connect web server to database server; - Answer-Router found in OSI layers data link, network, transport, session, and application; defines what traffic should go between two networks; can be software that runs in virtual machine or physical server like hardware - Answer-Firewalls operates the network and transport layers; - Answer-Firewall Layer 4 operates at session, presentation, and application layers; decrypt and analyze the content flowing through - Answer-Firewall Layer 7