Flashcards › Flashcards Network Essentials 4-6

The main differences between the types of network cabling are: the distance that a signal can travel, the type of signal that the media can transmit, and the speed at which the signal can be sent When a signal travels across network medium, it signal loses strength the further it gets from the transmitting station, to the point where the receiving station can no longer interpret the signals correctly. This is called ___. attenuation What is the maximum cable length for both category 5e and category 6 UTP cable? 100 meters A length of cable that connects a computer to either a networking device or to an RJ-45 jack is called ___. patch cable The entrance facility is the place where the connection to a WAN is located. It is basically the point where the LAN begins and ends. What is another name for this point? demarcation point Advantages to fiber-optic cabling include: long distances, high bandwidth, low susceptibility to eavesdropping The Transport layer deals with which unit of information? segment In what layer does the NIC operate? Network Access Layer In which layer does a router operate? Internetwork Layer Which protocol is responsible for determining the MAC address associated with each IP address and keeping a table of its results? ARP (Address Resolution Protocol) TCP establishes a connection with the destination device using which process? three-way handshake Application layer protocols examples: DNS, DHCP, SMTP, HTTP, FTP How many host addresses are available on a Class C network? 254 What process must be in operation on your network to allow several workstations to have access to the Internet using only one public IP address? PAT (Port Address Translation) Which part of a computer’s IP address configuration indicates the portion of the address that specifies the network ID? subnet mask What is the decimal equivalent to the binary number 11000011? 195 How many bits are in an IPv6 address? 128 The last 64 bits of an IPv6 address are the interface identifier. Where is that number derived from? the MAC address Which OSI layer is responsible for establishing a connection between the source and destination? Session Layer Which OSI layer of the OSI model is responsible for encryption and decryption? Presentation Layer What is a PDU? It is the name given to the unit of information used by each layer. 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? encapsulation What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device? sequence number What is the IEEE standard that governs all forms of Ethernet media? 802.3 Which is the IEEE standard that sets the standards for wireless networking? 802.11 Which OSI layer is responsible for determining the best path a packet should travel across an internetwork? 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? access control Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control sublayer? Data Link 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? Presentation The Transport layer segments data into smaller chunks, the size of which is determined by ___. MTU (Maximum transmission unit) When copper wires are bundled together, they are susceptible to ____________, a form of interference where the signals leak out onto other wires. crosstalk An IP address is composed of two parts, one is the ____________ ID and one is the host ID. network The PDU at the Data Link layer is called a ___. frame The process of stripping the header and trailer from a PDU is called ___. deencapsulation The four layers of the TCP/IP protocol suite are Application, ___, Internetwork, and Network Access. Transport A type of wireless network that uses light beams to send signals between two devices and is highly susceptible to visible light sources is called ___. infrared A wireless ___ using line-of-sight or broadcast transmissions can extend a wired network over a short distance that would normally require a dedicated communication line from a communications carrier. bridge ___are sets of rules and procedures that dictate communication and behavior. Protocols ___ is a way of breaking a large address space into more, smaller, address spaces. Subnetting An address that can only be used on the internal network and cannot be used to access the Internet is called a ___ address. private This protocol uses port numbers as source and destination identifiers Transport layer Hubs operate at this layer. Physical layer This sublayer manages access to the physical medium. Media Access Control sublayer This sublayer is responsible for some error recovery. Logical Link Control sublayer This is the general framework for how networking systems should operate. OSI reference model A type of address that is automatically assigned when no DHCP server can be contacted. APIPA A method of IP addressing that allows more efficient use of IP addresses. CIDR A protocol in which only e-mail headers are downloaded to the host until the message is opened. IMAP _____ translates private IP address to public IP address. NAT _____ is a Transport layer protocol that is connection-oriented and reliable. TCP Flashcards Network Essentials 4-6

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