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67 Cards in this Set
- Front
- Back
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Things which cause lan traffic congestion
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a.Too many host in broadcast domain
b.Multicasting c.Low bandwidth d.Using hubs e.Arp or ipx traffic |
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What is a broadcast domain?
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A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer
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What is network segmentation
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a.Breaking up large networks into smaller ones
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What are the advantages in using routers on your network
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They dont forward packets by default and they filter layer 3 network traffic.
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What are four functions a router can perform
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Packet filtering, packet switching,path selection, internetwork communication.
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Switches are used to help break up "what"
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collision domains
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A collision domain is "what"
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A situtation where one device on a network segment sends a packet and all other devices on that segment must pay attention to it.
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What is the purpose of the OSI reference model.
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Helps vendors create interoperable network devices and software in the form of protocols so that different vendors can work together.
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OSI reference model: What is the function of the application layer?
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Provides an interface where the application layer can forward information from the user interface down the protocol stack.
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OSI ref: What is the function of the presentation layer.
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It presents data to the application layer and is responsible for data translation and code formatting.
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OSI reference: What is the function of the session layer.
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responisble for setting up, managing, and then tearing down sessions between presentation layer entities.
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OSI ref: What is the function of the transport layer?
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the transport layer segments and reassembles data into a data stream. Establishes a logical connection between the sending host and the destination host.
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what is a window in terms of network traffic flow control
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the quantity of data segments in bytes that the transmitting machine is allowed to send without receiving an acknowledgement for them.
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OSI Ref:What is the purpose of the network layer.
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Manages device addressing, tracks location of devices on the network and determines the best way to move data.
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What are the two types of packets used at the network layer.
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data and route updates.
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What is a data packet used for?
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To transport user data through the internetwork.
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What layer 3 protocols are used for data traffic?
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they are called routed protocols and include IP and IPv6
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What layer 3 protocols are used to transport route update packets?
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RIP,RIPv2,EIGRP,OSPF
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List 3 types of information that is contained in a routing table
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Protocol-specific network addresses,
The interface the packet will take to the destination network Metric:distance to the remote network. |
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Fill in the Blank:Routers by default will not forward any "blank" packets or "blank" packets
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broadcast,multicast
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Fill in the blank:Routers use the _______ in the network layer header to determine the next hop router to forward the packet to
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logical address
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Fill in the Blank:Routers use _____ to control security on the types of packets that are allowed to enter or exit an interface
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access lists
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Routers can provide connections between virtual lans. True or False
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True
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True or False: Routers can provide QOS for specific types of network traffic.
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True
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OSI reference model:What functions does the Data Link Layer provide
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Provides the physical transmission of the data, handles error notification, network topology, and flow control. It translates the messages from the network layer into bits for the physical layer to transmit.
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Fill in the blank: The datalink layer formats messages into pieces called a _______.
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data frame
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True or False: The network layer is responsible for the actual unique identification of each device that resides on a network.
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False, the datalink layer is responsible for this.
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The datalink layer includes 2 sub layers. What are they?
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Media Access Control (mac) and Logical Link Control (llc)
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OSI ref model: What is the MAC sublayer responsible for?
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Defines how frames are placed on the media.
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OSI ref model: What is the function of the LLC sublayer?
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Responsible for indentifying network layer protocols and then encapsulating them.
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Define: Latency as related to layer 2 switching
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The time measured from when a frame enters a port to the time it exits a port.
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Fill in the blank:Networks are to routers as individual devices are to______
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Switches.
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Fill in the blank:Routing tables that map an internetwork are to routers as _____ that map individual devices are for switches and bridges
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filter table.
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define:Transparent bridging
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when a layer 2 device such as a switch forwards a frame only to the segment where the destination hardware address is located. The device will block the frame from going to any other segments.
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Fill in the Blank: All devices that receive a broadcast message are said to be on the same _______
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broadcast domain.
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OSI ref model: The physical layer does essentially two things. What are they.
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Sends bits and receives bits.
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Fill in the blank: A hub is actually a ______.
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multiple port repeater.
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What protocol helps devices share bandwidth evenly without having two devices transmit at the same time on the network medium
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csma/cd
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How does CSMA/CD handle a collision on an ethernet lan.
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1. a jam signal informs all devices that a collision occurs
2. The collision invokes a random backoff algorithm 3.each device on the ethernet segment stops transmiting for a random amout of time 4.all hosts have equal priority to start transmitting after their timers have expired. |
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What are the effects of having a csma/cd network with heavy collisions.
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1.delay
2.low throughput 3.congestion |
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True or False: There are no collisions in full duplex mode.
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true
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A dedicated switch port is not required for each full duplex node.
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False
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To operate in full duplex the host and switch port must both be cable of running in full duplex mode.
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True
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Fill in the Blank:______are used at the Data link layer to encapsulate packets handed down fromt the network layer for transmission on a type of media access.
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Frames
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Fill in the blank:cat5 cable is better than cat3 cable because it has more twist per foot and therefore less ______>
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Crosstalk:unwanted signal interferance from adjacent cables.
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You can use a straight through cable to connect what to what
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1.Host to a switch or hub
2.router to switch or hub |
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You can use a crossover cable to connect what to what?
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1.switch to switch
2.hub to hub 3.host to host 4.hub to switch 5.router direct to host |
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Fill in the blank: A rolled cable is used to connect what to what.
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a host to a router console serial comm port.
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which layer in the osi model set up a virtual circuit between the sending and receiving devices?
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transport
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Define:encapsulation in terms of the osi model
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Data that is wrapped in protocol information at each layer in the osi model
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define:PDU what it is used for
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Protocol Data Unit:A segment of data generated by a specific layer in a protocol stack; usually consists of a block of data from a higher layer. It is used to communicate and exchange information between layers of the osi model.
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Fill in the Blank:a data segment that has a transport layer header attached to it is now called ______?
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segment
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Fill in the blank: A data segment that is handed down to the network layer that has a control header added to it is now called a ______
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Packet or datagram
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Fill in the blank: After a packet or segment is handed to the datalink layer each packet is encapsulated and now becomes a ______?
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frame
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CISCO 3 LAYER HIERARCHICAL MODE:What is the core layer responsible for?
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Responsible for transporting large amounts of traffic reliably and quickly.
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CISCO 3 LAYER HIERARCHICAL MODE: The Distribtion layer provides _____ _____ ____
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routing, packet filtering, defining broadcast and mulitcast domains, implement security and network policies.
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CISCO 3 LAYER HIERARCHICAL MODE:The access layer provides ________?
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a means to control users and workgroup access to network resources, creation of separate collision domains (segmentation).
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OSI ref: Which layer chooses and determines the availability of communicating partners along with resources necessary to make the connection, coordinates partnering apps. , and forms a consensus on procedures for controlling data integrity and error recovery
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application
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which layer provides the physical transmission of the data and handles error notification,network topology and flow control
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datalink
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This layer uses service access points
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datalink llc sublayer
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ethernet is defined at these layers.
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datalink and physical.
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This device breaks up collision domains and broadcast domains
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Router
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Fill in the blank: A field in the ieee ethernet frame header that contains the result of the CRC.
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FCS:Frame Check Sequence.
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what are the two purposes for segmentation with a bridge?
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break up collision domains,provide more bandwidth for users.
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name 3 types of flow control
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buffering,windowing,congestion avoidance.
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Fill in the blank. The Datalink llc sublayer uses a _____ _____ _____ identify which protocol handler should process an incoming frame.
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service access point
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A network segment is a
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portion of a computer network wherein every device communicates using the same physical layer. Devices that extend the physical layer, such as repeaters or network hubs, are also considered to extend the segment.
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