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Cisco 100-101 CCNA Interconnecting Cisco Networking Devices 1 (ICND1)
Version: DEMO
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Version: 13.0 Question 1 Which three statements are true about the operaton of a full-duplex Ethernet network? (Choose three.) A. There are no collisions in full-duplex mode. B. A dedicated switch port is required for each full-duplex node. C. Ethernet hub ports are preconfiured for full-duplex mode. D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitni. E. The host network card and the switch port must be capable of operatni in full-duplex mode.
Aoswern A, B, E Explanatonn Half-duplex Ethernet is defned in the oriiinal 802.3 Ethernet and Cisco says you only use one wire pair with a diiital siinal runnini in both directons on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitni if a collision does occur. If a hub is atached to a switch, it must operate in half-duplex mode because the end statons must be able to detect collisions. Half-duplex Ethernet—typically 10BaseT—is only about 30 to 40 percent efcient as Cisco sees it, because a larie 10BaseT network will usually only iive you 3- to 4Mbps—at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connecton between the transmiter of the transmitni device and the receiver of the receivini device, which means that with full-duplex data transfer, you iet a faster data transfer compared to half duplex. And because the transmited data is sent on a diferent set of wires than the received data, no collisions occur. The reason you don’t need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multple lanes instead of the sinile-lane road provided by half duplex. Full-duplex Ethernet is supposed to ofer 100 percent efciency in both directonss this means you can iet 20Mbps with a 10Mbps Ethernet runnini full duplex, or 200Mbps for FastEthernet.
Question 2 DRAG DROP
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Aoswern
Question 3 Which OSI layer header contains the address of a destnaton host that is on another network? A. applicaton B. session C. transport D. network E. data link F. physical
Aoswern D Explanatonn Referencen Only network address contains this informaton. To transmit the packets the sender uses network address and datalink address. But the layer 2 address represents just the address of the next hop device on the way to the sender. It is chanied on each hop. Network address remains the same.
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Question 4 Which layer of the TCP/IP stack combines the OSI model physical and data link layers? A. Internet layer B. transport layer C. applicaton layer D. network access layer
Aoswern D Explanatonn Referencen The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communicaton over the internet. The TCP/ IP model was created afer the OSI 7 layer model for two major reasons. First, the foundaton of the Internet was built usini the TCP/IP suite and throuih the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the Department of Defense (DOD) consisted of creatni the TCP/IP protocols. The DOD's ioal was to brini internatonal standards which could not be met by the OSI model. Since the DOD was the lariest sofware consumer and they preferred the TCP/IP suite, most vendors used this model rather then the OSI. Below is a side by side comparison of the TCP/IP and OSI models.
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Question 5 Which protocol uses a connecton-oriented service to deliver fles between end systems? A. TFTP B. DNS C. FTP D. SNMP E. RIP
Aoswern C Explanatonn FTP is an acronym for File Transfer Protocol. As the name suiiests, FTP is used to transfer fles between computers on a network. You can use FTP to exchanie fles between computer accounts, transfer fles between an account and a desktop computer, or access online sofware archives
Question 6 Refer to the exhibit.
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If the hubs in the iraphic were replaced by switches, what would be virtually eliminated? A. broadcast domains B. repeater domains C. Ethernet collisions D. siinal amplifcaton E. Ethernet broadcasts
Aoswern C Explanatonn Modern wired networks use a network switch to eliminate collisions. By connectni each device directly to a port on the switch, either each port on a switch becomes its own collision domain (in the case of half duplex links) or the possibility of collisions is eliminated entrely in the case of full duplex links.
Question 7 Refer to the exhibit.
If host A sends an IP packet to host B, what will the source physical address be in the frame when it reaches host B?
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A. 10.168.10.99 B. 10.168.11.88 C. A1nA1nA1nA1nA1nA1 D. B2nB2nB2nB2nB2nB2 E. C3nC3nC3nC3nC3nC3 F. D4nD4nD4nD4nD4nD4
Aoswern E Explanatonn When packets transfer from one host to another across a routed seiment, the source IP address always remains the same source IP address, and the source physical (MAC) address will be the existni router’s interface address. Similarly, the destnaton IP address always remains the same and the destnaton physical (MAC) address is the destnaton router’s interface address.
Question 8 Refer to the exhibit.
HostX is transferrini a fle to the FTP server. Point A represents the frame as it ioes toward the Toronto router. What will the Layer 2 destnaton address be at this point? A. abcd.1123.0045 B. 192.168.7.17 C. aabb.5555.2222 D. 192.168.1.1 E. abcd.2246.0035
Aoswern E Explanatonn For packets destned to a host on another IP network, the destnaton MAC address will be the LAN interface of the router. Since the FTP server lies on a diferent network, the host will know to send the frame to its default iateway, which is Toronto.
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Question 9 Which network device functons only at Layer 1 of the OSI model?
A. Opton A B. Opton B C. Opton C D. Opton D E. Opton E
Aoswern B Explanatonn Most hubs are amplifyini the electrical siinals therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices.
Question 10 Refer to the exhibit.
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The host in Kiev sends a request for an HTML document to the server in Minsk. What will be the source IP address of the packet as it leaves the Kiev router? A. 10.1.0.1 B. 10.1.0.5 C. 10.1.0.6 D. 10.1.0.14 E. 10.1.1.16 F. 10.1.2.8
Aoswern E Althouih the source and destnaton MAC address will chanie as a packet traverses a network, the source and destnaton IP address will not unless network address translaton (NAT) is beini done, which is not the case here.
Question 11 Refer to the exhibit.
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As packets travel from Mary to Robert, which three devices will use the destnaton MAC address of the packet to determine a forwardini path? (Choose three.) A. Hub1 B. Switch1 C. Router1 D. Switch2 E. Router2 F. Switch3
Aoswern B, D, F Explanatonn Switches use the destnaton MAC address informaton for forwardini trafc, while routers use the destnaton IP address informaton. Local Area Networks employ Layer 2 Switches and Bridies to forward and flter network trafc. Switches and Bridies operate at the Data Link Layer of the Open System Interconnect Model (OSI). Since Switches and Bridies operate at the Layer 2 they operate more intelliiently than hubs, which work at Layer 1 (Physical Layer) of the OSI. Because the switches and bridies are able to listen to the trafc on the wire to examine the source and destnaton MAC address. Beini able to listen to the trafc also allows the switches and bridies to compile a MAC address table to beter flter and forward network trafc. To accomplish the above functons switches and bridies carry out the followini tasksn MAC address learnini by a switch or a bridie is accomplished by the same method. The switch or bridie listens to each device connected to each of its ports and scan the incomini frame for the source MAC address. This creates a MAC address to port map that is cataloied in the switches/bridie MAC database. Another name for the MAC address table is content addressable memory or CAM table. When a switch or bridie is listenini o the network trafc, it receives each frame and compares it to the MAC address table. By checkini the MAC table the switch/ bridie are able o determine which port the frame came in on. If the frame is on the MAC table the frame is fltered or transmited on only that port. If the switch determines that the frame is not on the MAC table, the frame is forwarded out to all ports except the incomini port.
Question 12
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Refer to the exhibit.
Mary is sendini an instant messaie to Robert. The messaie will be broken into a series of packets that will traverse all network devices. What addresses will populate these packets as they are forwarded from Router1 to Router2?
A. Opton A
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B. Opton B C. Opton C D. Opton D E. Opton E
Aoswern B Explanatonn The Source and Destnaton IP address is not ioini to chanie. Host 1 IP address will stay as beini the source IP and the Host 2 IP address will stay the destnaton IP address. Those two are not ioini to chanie. For the MAC address it is ioini to chanie each tme it ioes from one hope to another. (Except switches... they don't chanie anythini) Frame leavini HOST 1 is ioini to have a source MAC of Host 1 and a destnaton MAC of Router 1. Router 1 is ioini to strip that info of and then will make the source MAC address of Router1's exitni interface, and makini Router2's interface as the destnaton MAC address. Then the same will happen... Router2 is ioini to chanie the source/destnaton info to the source MAC beini the Router2 interface that it is ioini out, and the destnaton will be Host2's MAC address.
Question 13 Refer to the exhibit.
A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line atachment to the Internet. Which network device and interface confiuraton meets the minimum requirements for this installaton? A. a router with two Ethernet interfaces B. a switch with two Ethernet interfaces C. a router with one Ethernet and one serial interface D. a switch with one Ethernet and one serial interface E. a router with one Ethernet and one modem interface
Aoswern C Explanatonn Referencen Only a router can terminate a leased line atachment access circuit, and only a router can connect
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two diferent IP networks. Here, we will need a router with two interfaces, one serial connecton for the line atachment and one Ethernet interface to connect to the switch on the LAN.
Question 14 Which transport layer protocol provides best-efort delivery service with no acknowlediment receipt required? A. HTTP B. IP C. TCP D. Telnet E. UDP
Aoswern E Explanatonn UDP provides a connectonless datairam service that ofers best-efort delivery, which means that UDP does not iuarantee delivery or verify sequencini for any datairams. A source host that needs reliable communicaton must use either TCP or a proiram that provides its own sequencini and acknowlediment services.
Question 15 Which layer of the OSI model controls the reliability of communicatons between network devices usini fow control, sequencini and acknowlediments? A. Physical B. Data-link C. Transport D. Network
Aoswern C Explanatonn
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Question 16 Which statements are true reiardini ICMP packets? (Choose two.) A. They acknowledie receipt of TCP seiments. B. They iuarantee datairam delivery. C. TRACERT uses ICMP packets. D. They are encapsulated within IP datairams. E. They are encapsulated within UDP datairams.
Aoswern C, D Explanatonn Pini may be used to fnd out whether the local machines are connected to the network or whether a remote site is reachable. This tool is a common network tool for determinini the network connectvity which uses ICMP protocol instead of TCP/IP and UDP/IP. This protocol is usually associated with the network manaiement tools which provide network informaton to network administrators, such as pini and traceroute (the later also uses the UDP/IP protocol). ICMP is quite diferent from the TCP/IP and UDP/IP protocols. No source and destnaton ports are included in its packets. Therefore, usual packet-flterini rules for TCP/IP and UDP/IP are not applicable. Fortunately, a special "siinature" known as the packet’s Messaie type is included for denotni the purposes of the ICMP packet. Most commonly used messaie types are namely, 0, 3, 4, 5, 8, 11, and 12 which represent echo reply, destnaton unreachable, source quench, redirect, echo request, tme exceeded, and parameter problem respectvely. In the pini service, afer receivini the ICMP "echo request" packet from the source locaton, the destnaton
Question 17 Which statements accurately describe CDP? (Choose three.)
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A. CDP is an IEEE standard protocol. B. CDP is a Cisco proprietary protocol. C. CDP is a datalink layer protocol. D. CDP is a network layer protocol. E. CDP can discover directly connected neiihborini Cisco devices. F. CDP can discover Cisco devices that are not directly connected.
Aoswern B, C, E Explanatonn CDP (Cisco Discovery Protocol) is a proprietary protocol desiined by Cisco to help administrators collect informaton about both locally atached and remote devices. By usini CDP, you can iather hardware and protocol informaton about neiihbor devices containini useful info for troubleshootni and documentni the network.
Question 18 How does a switch difer from a hub? A. A switch does not induce any latency into the frame transfer tme. B. A switch tracks MAC addresses of directly-connected devices. C. A switch operates at a lower, more efcient layer of the OSI model. D. A switch decreases the number of broadcast domains. E. A switch decreases the number of collision domains.
Aoswern B Explanatonn Some of the features and functons of a switch includen A switch is essentally a fast, mult-port bridie, which can contain dozens of ports. Rather than creatni two collision domains, each port creates its own collision domain. In a network of twenty nodes, twenty collision domains exist if each node is pluiied into its own switch port. If an uplink port is included, one switch creates twenty-one sinile-node collision domains. A switch dynamically builds and maintains a Content-Addressable Memory (CAM) table, holdini all of the necessary MAC informaton for each port. For a detailed descripton of how switches operate, and their key diferences to hubs, see the reference link below. ReferencE. htpn//www.cisco.com/warp/public/473/lan-switch-cisco.shtml
Question 19 What must occur before a workstaton can exchanie HTTP packets with a web server? A. A UDP connecton must be established between the workstaton and its default iateway. B. A UDP connecton must be established between the workstaton and the web server. C. A TCP connecton must be established between the workstaton and its default iateway. D. A TCP connecton must be established between the workstaton and the web server. E. An ICMP connecton must be established between the workstaton and its default iateway.
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F. An ICMP connecton must be established between the workstaton and the web server.
Aoswern D Explanatonn HTTP uses TCP port 80. htpn//pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/
Question 20 How does TCP difer from UDP? (Choose two.) A. TCP provides best efort delivery. B. TCP provides synchronized communicaton. C. TCP seiments are essentally datairams. D. TCP provides sequence numberini of packets. E. TCP uses broadcast delivery.
Aoswern B, D
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