Chapter 3

Match the TCP/IP layer to the protocol, service, or application that works within that layer. application layer -> transport layer -> internet layer -> network access layer ->

Application Layer DNS, BOOTP, DHCP, SMTP, POP, IMAP, FTP, TFTP, HTTP Transport Layer UDP, TCP Internet Layer IP, NAT, ICMP, OSPF, EIGRP Network Access Layer ARP, PPP, Ethernet, Interface Drivers

Which organization develops the 802 family of standards for wired and wireless LANs and MANs? ISOC ITU-T IEEE ISO IANA

IEEE

What organization developed the OSI reference model that is used in networking? ISOC TIA ISO EIA IANA

ISO

What is an advantage of using standards to develop and implement protocols? A particular protocol can only be implemented by one manufacturer. Products from different manufacturers can interoperate successfully. Different manufacturers are free to apply different requirements when implementing a protocol. Standards provide flexibility for manufacturers to create devices that comply with unique requirements.

Products from different manufacturers can interoperate successfully

What happens when two devices on the same subnet are communicating? The host portion of the IP addresses will be different. The data link layer addresses are added to the IP header. The sending device will use ARP to determine the IP address of the receiver. The frame will be sent to the default gateway for delivery to the receiving device.

The host portion of the IP addresses will be different. When two devices are on the same local network, the network portion of their IP addresses will be the same and the host portion of their IP addresses will be different. Two devices on the same network do not need the default gateway in order to communicate with one another. The default gateway is used when the destination IP address is on a different network.

Which statement is correct about network protocols? Network protocols define the type of hardware that is used and how it is mounted in racks. They define how messages are exchanged between the source and the destination. They all function in the network access layer of TCP/IP. They are only required for exchange of messages between devices on remote networks.

They define how messages are exchanged between the source and the destination. Network protocols are implemented in hardware, or software, or both. They interact with each other within different layers of a protocol stack. Protocols have nothing to do with the installation of the network equipment. network protocols are required to exchange information between source and destination devices in both local and remote networks.

Which message delivery option is used when all devices need to receive the same message simultaneously? duplex unicast multicast broadcast

broadcast When all devices need to receive the same message simultaneously, the message would be delivered as a broadcast. Unicast delivery occurs when one source host sends a message to one destination host. The sending of the same message from a host to a group of destination hosts is multicast delivery. Duplex communications refers to the ability of the medium to carry messages in both directions

What three functions are defined by network protocols to allow communication between known source and destination IP addresses? (Choose three.) connector specifications data encoding media selection message size delivery options end-device installation

data encoding message size delivery options Networking protocols include details of: addressing encoding size encapsulation type timing delivery options

Which logical address is used for delivery of data to a remote network? destination MAC address destination IP address destination port number source MAC address source IP address

destination IP address The destination IP address is used for end-to-end delivery of data to a remote network. The destination MAC address is used for delivery on a local network. The destination port number identifies the application that should process the data at the destination. Source addresses identify the sender of the data.

What type of delivery uses data link layer addresses? remote delivery local and remote delivery local delivery remote delivery using routers

local delivery If a device is sending frames to another device on the same local network, it uses ARP to determine the MAC address of the receiving device. The sending device then uses the Layer 2 addresses to send the frames.

What is the purpose of protocols in data communications? specifying the bandwidth of the channel or medium for each type of communication specifying the device operating systems that will support the communication providing the rules required for a specific type of communication to occur determining the electronic specifications to enable the communication

providing the rules required for a specific type of communication to occur Protocols provide rules that define how a message is transmitted across a network. Implementation requirements such as electronic and bandwidth details for data communication are specified by standards. Operating systems are not specified by protocols, but will implement protocols.

Which two message timing mechanisms are used in data communications? (Choose two.) response timeout formatting encapsulation flow control encoding

response timeout flow control Flow control and response timeout are two message timing mechanisms that are used in communications to manage the number of messages sent at once and to manage the period to wait for a response. Encoding, encapsulation, and formatting relate to message structure and representation, not timing

Which two components are added to the PDU at the network access layer? (Choose two.) trailer IP header TCP header HTTP header frame header

trailer frame header When an IP packet is sent to the network access layer, it is encapsulated within a frame header and trailer. The frame is then converted to bits that are transmitted over the media.