DCOM 101 Final Exam questions with answers

DCOM 101 Final Exam questions with answers The Physical layer has been divided into two sublayers, called the LLC sublayer and the MAC sublayer - ANSWERS False Which layer has been subdivided into the Logical Link Control sublayer and the Media Access 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 is called a ____________. - ANSWERS Frame How can you find out what your MA