DCOM 101 Final Exam questions with answers

Control sublayer? - ANSWERS Data Link Which layer is responsible for establishing communication setup between the source and destination computers? - ANSWERS Session Switches operate at this layer - ANSWERS Data Link Layer Hubs operate at this layer - ANSWERS Physical Layer Sublayer manages access to the physical medium. - ANSWERS Media Access Control sublayer Computers operate at this layer. - ANSWERS Application Layer This sublayer is responsible for some error recovery. - ANSWERS Logical Link Control sublayer This is the general framework for how networking systems should operate. - ANSWERS OSI reference model Routers operate at this layer - ANSWERS Network layer This layer handles data formatting and translation - ANSWERS Presentation layer This uses port numbers as source and destination identifiers - ANSWERS Transport layer This handles communication setup and teardown - ANSWERS Session layer Which of the following is the correct order of the layers of the OSI model from layer 1 to layer 7? - ANSWERS Physical, Data Link, Network, Transport, Session, Presentation, Application The process of stripping the header and trailer from a PDU is called ____________. - ANSWERS deencapsulation You are working at the help desk and you get a message that a user cannot access the Internet. You open a command prompt, ping the workstation's IP address, and get a response. You ask the user to try the Internet again. He does so with the same result— no connection. Which type of device is most likely to be the problem? - ANSWERS Network layer device At what layer do NICs operate? - ANSWERS Data Link Which layer of the OSI model is responsible for encryption and decryption? - ANSWERS Presentation at each layer of the OSI model, data is appended to the original message and then sent on to the next lower layer. What is this process called? - ANSWERS encapsulation The Transport layer segments data into smaller chunks, the size of which is determined by which of the following? - ANSWERS MTU What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device? - ANSWERS sequence number What layer is responsible for making sure that the data that it sends and receives is in a format that the receiving and sending computers can understand - ANSWERS 6 What is the IEEE standard that governs all forms of Ethernet media and interfaces? - ANSWERS 802.3 What is a PDU? - ANSWERS It is the name given to the unit of information used by each layer. The ____________ reference model is a general framework for networking systems that uses a layered approach to reduce its complexity. - ANSWERS OSI One of the problems that can occur in the Network layer is the incorrect configuration of a hosts IP address. - ANSWERS True Which layer is responsible for determining the best path a packet should travel across an internetwork? - ANSWERS Network One job that a router performs is that of gatekeeper, which means that it can be configured to only allow certain packets access into the network based on a list of rules. What is that process called? - ANSWERS access control What information would you find in the header of a Transport layer PDU? - ANSWERS window size The Network layer communicates with the Data Link layer and the Session layer - ANSWERS False Which layer is responsible for the encoding of signals? - ANSWERS 1 The ____________ layer is the bottom layer, whose job it is to convert bits into signals and vice versa. - ANSWERS Physical The maximum transmission unit for Ethernet is 1518 bytes - ANSWERS True Which of the following are protocols that you find at the Application layer of the OSI model? - ANSWERS SNMP FTP DHCP The PDU at the Data Link layer i