Operation of IP Data Networks

drepitts8's version from 2016-02-06 02:06


Question Answer
SNMPa protocol used to monitor and manage network devices.
FTPa reliable, connection-oriented service that uses TCP to transfer files between systems.
TFTPa connectionless service that uses UDP to transfer files between systems.
DNSa protocol that converts human-readable names into machine-readable addresses.
DHCPused to assign IP addresses automatically and set parameters such as subnet mask and default gateway.


Question Answer
straight-throughSwitch to router Switch to PC or server Hub to PC or server Hub to Router
crossover cablesSwitch to switch Switch to hub Hub to hub Router to router PC to PC Router to PC
Rollover cablea terminal (PC) and a console port
ARPA PC sends packets to the default gateway IP address the first time since the PC turned on.
ICMPThe network administrator is checking basic IP connectivity from a workstation to a server.


Question Answer
DNSThe TCP/IP protocol stack must find an IP address for packets destined for a URL.
DHCPA network device will automatically assign IP addresses to workstations.
A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?Data link
Which statements are true regarding ICMP packets?TRACERT uses ICMP packets. They are encapsulated within IP datagrams.
What must occur before a workstation can exchange HTTP packets with a web server?A TCP connection must be established between the workstation and the web server.


Question Answer
Ping usesICMP protocol, at the Network layer.
What is the purpose of flow control?to provide a means for the receiver to govern the amount of data sent by the sender.
A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the network administrator is using for this operation?Application
Which layer of the TCP/IP stack combines the OSI model physical and data link layers?Network access layer
Application layerSMTP


Question Answer
Transport layerTCP
Internet layerIP
Network access layerEthernet
What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address?sends out an ARP request with the destination IP address.
Which of the following are types of flow control?Buffering, Windowing, Congestion avoidance


Question Answer
Bufferingused by network devices to temporarily store bursts of excess data in memory until they can be processed.
Source Quench Messages used by receiving devices to help prevent their buffers from overflowing.
Windowinga flow-control method in which the source device requires an acknowledgement from the destination after a certain number of packets have been transmitted.
Which two characteristics describe the access layer of the hierarchical network design model?port security, VLANs
Which protocol uses a connection-oriented service to deliver files between end systems?FTP


Question Answer
At which layer of the OSI model does the protocol that provides the information displayed by the show cdp neighbors command operate?data link
A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?Decrease the window size.
A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server?ARP
Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required?UDP
Where does routing occur within the DoD TCP/IP reference model?Internet


Question Answer
Which layer of the OSI model controls the reliability of communications between network devices using flow control, sequencing and acknowledgments?Transport
On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor?CDP
CDPCisco Discovery Protocol
NATA PC with address must access devices on the Internet.
DHCPOnly routers and servers require static IP addresses. Easy IP administration is required.


Question Answer
DNSA PC only knows a server as //MediaServer. IP needs to send data to that server.
OSPFA protocol is needed to replace current static routes with automatic route updates.
CDPis a Cisco proprietary protocol.
CDPis a datalink layer protocol.
CDPcan discover directly connected neighboring Cisco devices.


Question Answer
Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?Application
IP addressesSegments
Which of the following correctly describe steps in the OSI data encapsulation process?The transport layer divides a data stream into segments and may add reliability and flow control information. Packets are created when the network layer adds Layer 3 addresses and control information to a segment.


Question Answer
How does TCP differ from UDP?TCP provides synchronized communication. TCP provides sequence numbering of packets.
What are two common TCP applications?SMTP, FTP
Which OSI layer header contains the address of a destination host that is on another network?Network
What is the first 24 bits in a MAC address called?OUI