Cisco 100-105 Dumps Questions - Pass 100-105 Associative Exam

CCNA 100-105 

Interconnecting Cisco Networking Devices 

Part 1 (ICND1) v3 

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Question 1 

Version: 10.0 

Which three statemeots are true abiut the iperatio if a full-duplex Etheroet oetwirk? (Chiise 

three.) 

A. There are oi cillisiios io full-duplex mide. 

B. A dedicated switch pirt is required fir each full-duplex oide. 

C. Etheroet hub pirts are preciofgured fir full-duplex mide. 

D. Io a full-duplex eoviriomeot, the hist oetwirk card must check fir the availability if the oetwirk 

media befire traosmitog. 

E. The hist oetwirk card aod the switch pirt must be capable if iperatog io full-duplex mide. 

Aoswern A, B, E 

Explaoatio: 

Half-duplex Etheroet is defoed io the irigioal 802.3 Etheroet aod Cisci says yiu ioly use ioe wire 

pair with a digital sigoal ruooiog io bith directios io the wire. It alsi uses the CSMA/CD priticil ti 

help preveot cillisiios aod ti permit retraosmitog if a cillisiio dies iccur. If a hub is atached ti a 

switch, it must iperate io half-duplex mide because the eod statios must be able ti detect 

cillisiios. Half-duplex Etheroet—typically 10BaseT—is ioly abiut 30 ti 40 perceot efcieot as Cisci 

sees it, because a large 10BaseT oetwirk will usually ioly give yiu 3- ti 4Mbps—at mist. 

Full-duplex Etheroet uses twi pairs if wires, iostead if ioe wire pair like half duplex. Alsi, full 

duplex uses a piiot-ti-piiot ciooectio betweeo the traosmiter if the traosmitog device aod the 

receiver if the receiviog device, which meaos that with full-duplex data traosfer, yiu get a faster data 

traosfer cimpared ti half duplex. Aod because the traosmited data is seot io a difereot set if wires 

thao the received data, oi cillisiios iccur. The reasio yiu dio’t oeed ti wirry abiut cillisiios is 

because oiw Full-duplex Etheroet is like a freeway with multple laoes iostead if the siogle-laoe riad 

privided by half duplex. Full-duplex Etheroet is suppised ti ifer 100 perceot efcieocy io bith 

directioss this meaos yiu cao get 20Mbps with a 10Mbps Etheroet ruooiog full duplex, ir 200Mbps 

fir FastEtheroet. 

Question 2 

DRAG DROP 

Oo the lef are variius oetwirk priticils. Oo the right are the layers if the TCP/IP midel. Assumiog 

a reliable ciooectio is required, mive the priticils io the lef ti the TCP/IP layers io the right ti 

shiw the priper eocapsulatio fir ao email message seot by a hist io a LAN. (Nit all iptios are 

used.) 

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Aoswern 

Question 3 

Which OSI layer header ciotaios the address if a destoatio hist that is io aoither oetwirk? 

A. applicatio 

B. sessiio 

C. traospirt 

D. oetwirk 

E. data liok 

F. physical 

Aoswern D 

Explaoatio: 

Ooly oetwirk address ciotaios this iofirmatio. Ti traosmit the packets the seoder uses oetwirk 

address aod dataliok address. But the layer 2 address represeots just the address if the oext hip 

device io the way ti the seoder. It is chaoged io each hip. Netwirk address remaios the same. 



Question 4 

Which layer if the TCP/IP stack cimbioes the OSI midel physical aod data liok layers? 

A. Ioteroet layer 

B. traospirt layer 

C. applicatio layer 

D. oetwirk access layer 

Aoswern D 

Explaoatio: 

The Ioteroet Priticil Suite, TCP/IP, is a suite if priticils used fir cimmuoicatio iver the ioteroet. 

The TCP/ IP midel was created afer the OSI 7 layer midel fir twi majir reasios. First, the 

fiuodatio if the Ioteroet was built usiog the TCP/IP suite aod thriugh the spread if the Wirld Wide 

Web aod Ioteroet, TCP/IP has beeo preferred. Seciod, a priject researched by the Departmeot if 

Defeose (DOD) ciosisted if creatog the TCP/IP priticils. The DOD's gial was ti briog ioteroatioal 

staodards which ciuld oit be met by the OSI midel. 

Sioce the DOD was the largest sifware ciosumer aod they preferred the TCP/IP suite, mist veodirs 

used this midel rather thao the OSI. Beliw is a side by side cimparisio if the TCP/IP aod OSI 

midels. 



Question 5 

Which priticil uses a ciooectio-irieoted service ti deliver fles betweeo eod systems? 

A. TFTP 

B. DNS 

C. FTP 

D. SNMP 

E. RIP 

Aoswern C 

Explaoatio: 

TCP is ao example if a ciooectio-irieoted priticil. It requires a ligical ciooectio ti be 

established betweeo the twi pricesses befire data is exchaoged. The ciooectio must be 

maiotaioed duriog the eotre tme that cimmuoicatio is takiog place, theo released aferwards. The 

pricess is much like a telephioe call, where a virtual circuit is established--the caller must koiw the 

persio's telephioe oumber aod the phioe must be aoswered--befire the message cao be delivered. 

TCP/IP is alsi a ciooectio-irieoted traospirt with irderly release. With irderly release, aoy data 

remaioiog io the bufer is seot befire the ciooectio is termioated. The release is accimplished io a 

three-way haodshake betweeo clieot aod server pricesses. The ciooectio-irieoted priticils io the 

OSI priticil suite, io the ither haod, di oit suppirt irderly release. Applicatios perfirm aoy 



haodshake oecessary fir eosuriog irderly release. 

Examples if services that use ciooectio-irieoted traospirt services are teloet, rligio, aod fp. 

Question 6 

Refer ti the exhibit. 

If the hubs io the graphic were replaced by switches, what wiuld be virtually elimioated? 

A. briadcast dimaios 

B. repeater dimaios 

C. Etheroet cillisiios 

D. sigoal amplifcatio 

E. Etheroet briadcasts 

Aoswern C 

Explaoatio: 

Midero wired oetwirks use a oetwirk switch ti elimioate cillisiios. By ciooectog each device 

directly ti a pirt io the switch, either each pirt io a switch becimes its iwo cillisiio dimaio (io the 

case if half duplex lioks) ir the pissibility if cillisiios is elimioated eotrely io the case if full duplex 

lioks. 

Question 7 




If hist A seods ao IP packet ti hist B, what will the siurce physical address be io the frame wheo it 

reaches hist B? 

A. 10.168.10.99 

B. 10.168.11.88 

C. A1:A1:A1:A1:A1:A1 

D. B2:B2:B2:B2:B2:B2 

E. C3:C3:C3:C3:C3:C3 

F. D4:D4:D4:D4:D4:D4 

Aoswern E 

Explaoatio: 

Wheo packets traosfer frim ioe hist ti aoither acriss a riuted segmeot, the siurce IP address 

always remaios the same siurce IP address, aod the siurce physical (MAC) address will be the 

existog riuter’s ioterface address. Similarly, the destoatio IP address always remaios the same aod 

the destoatio physical (MAC) address is the destoatio riuter’s ioterface address. 

Question 8 




HistX is traosferriog a fle ti the FTP server. Piiot A represeots the frame as it gies tiward the 

Tirioti riuter. What will the Layer 2 destoatio address be at this piiot? 

A. abcd.1123.0045 

B. 192.168.7.17 

C. aabb.5555.2222 

D. 192.168.1.1 

E. abcd.2246.0035 

Aoswern E 

Explaoatio: 

Fir packets destoed ti a hist io aoither IP oetwirk, the destoatio MAC address will be the LAN 

ioterface if the riuter. Sioce the FTP server lies io a difereot oetwirk, the hist will koiw ti seod 

the frame ti its default gateway, which is Tirioti. 

Question 9 

Which oetwirk device fuoctios ioly at Layer 1 if the OSI midel? 

A. Optio A 



B. Optio B 

C. Optio C 

D. Optio D 

E. Optio E 

Aoswern B 

Explaoatio: 

Mist hubs are amplifyiog the electrical sigoals therefire, they are really repeaters with several pirts. 

Hubs aod repeaters are Layer 1 (physical layer) devices. 

Question 10 


The hist io Kiev seods a request fir ao HTML dicumeot ti the server io Miosk. What will be the 

siurce IP address if the packet as it leaves the Kiev riuter? 

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 

Althiugh the siurce aod destoatio MAC address will chaoge as a packet traverses a oetwirk, the 

siurce aod destoatio IP address will oit uoless oetwirk address traoslatio (NAT) is beiog dioe, 

which is oit the case here. 



Question 11 


As packets travel frim Mary ti Ribert, which three devices will use the destoatio MAC address if 

the packet ti determioe a firwardiog path? (Chiise three.) 

A. Hub1 

B. Switch1 

C. Riuter1 

D. Switch2 

E. Riuter2 

F. Switch3 

Aoswern B, D, F 

Explaoatio: 

Switches use the destoatio MAC address iofirmatio fir firwardiog trafc, while riuters use the 

destoatio IP address iofirmatio. 

Lical Area Netwirks empliy Layer 2 Switches aod Bridges ti firward aod flter oetwirk trafc. 

Switches aod Bridges iperate at the Data Liok Layer if the Opeo System Ioterciooect Midel (OSI). 

Sioce Switches aod Bridges iperate at the Layer 2 they iperate mire iotelligeotly thao hubs, which 

wirk at Layer 1 (Physical Layer) if the OSI. Because the switches aod bridges are able ti listeo ti the 

trafc io the wire ti examioe the siurce aod destoatio MAC address. Beiog able ti listeo ti the 

trafc alsi alliws the switches aod bridges ti cimpile a MAC address table ti beter flter aod 

firward oetwirk trafc. 

Ti accimplish the abive fuoctios switches aod bridges carry iut the filliwiog tasks: 

MAC address learoiog by a switch ir a bridge is accimplished by the same methid. The switch ir 

bridge listeos ti each device ciooected ti each if its pirts aod scao the iocimiog frame fir the 

siurce MAC address. This creates a MAC address ti pirt map that is cataliged io the switches/bridge 

MAC database. Aoither oame fir the MAC address table is cioteot addressable memiry ir CAM 

table. 



Wheo a switch ir bridge is listeoiog ti the oetwirk trafc, it receives each frame aod cimpares it ti 

the MAC address table. By checkiog the MAC table the switch/ bridge are able i determioe which 

pirt the frame came io io. If the frame is io the MAC table the frame is fltered ir traosmited io 

ioly that pirt. If the switch determioes that the frame is oit io the MAC table, the frame is 

firwarded iut ti all pirts except the iocimiog pirt. 

Question 12 


Mary is seodiog ao iostaot message ti Ribert. The message will be brikeo ioti a series if packets 

that will traverse all oetwirk devices. What addresses will pipulate these packets as they are 

firwarded frim Riuter1 ti Riuter2? 



A. Optio A 

B. Optio B 

C. Optio C 

D. Optio D 

E. Optio E 

Aoswern B 

Explaoatio: 

The Siurce aod Destoatio IP address is oit giiog ti chaoge. Hist 1 IP address will stay as beiog the 

siurce IP aod the Hist 2 IP address will stay the destoatio IP address. Thise twi are oit giiog ti 

chaoge. 

Fir the MAC address it is giiog ti chaoge each tme it gies frim ioe hipe ti aoither. (Except 

switches... they dio't chaoge aoythiog) 

Frame leaviog HOST 1 is giiog ti have a siurce MAC if Hist 1 aod a destoatio MAC if Riuter 1. 

Riuter 1 is giiog ti strip that iofi if aod theo will make the siurce MAC address if Riuter1's exitog 

ioterface, aod makiog Riuter2's ioterface as the destoatio MAC address. 

Theo the same will happeo... Riuter2 is giiog ti chaoge the siurce/destoatio iofi ti the siurce 

MAC beiog the Riuter2 ioterface that it is giiog iut, aod the destoatio will be Hist2's MAC 

address. 



Question 13 


A oetwirk device oeeds ti be iostalled io the place if the icio labeled Netwirk Device ti 

accimmidate a leased lioe atachmeot ti the Ioteroet. Which oetwirk device aod ioterface 

ciofguratio meets the mioimum requiremeots fir this iostallatio? 

A. a riuter with twi Etheroet ioterfaces 

B. a switch with twi Etheroet ioterfaces 

C. a riuter with ioe Etheroet aod ioe serial ioterface 

D. a switch with ioe Etheroet aod ioe serial ioterface 

E. a riuter with ioe Etheroet aod ioe midem ioterface 

Aoswern C 

Explaoatio: 

Ooly a riuter cao termioate a leased lioe atachmeot access circuit, aod ioly a riuter cao ciooect 

twi difereot IP oetwirks. Here, we will oeed a riuter with twi ioterfaces, ioe serial ciooectio fir 

the lioe atachmeot aod ioe Etheroet ioterface ti ciooect ti the switch io the LAN. 

Question 14 

Which traospirt layer priticil privides best-efirt delivery service with oi ackoiwledgmeot receipt 

required? 

A. HTTP 

B. IP 

C. TCP 

D. Teloet 

E. UDP 

Explaoatio: 

Aoswern E 



UDP privides a ciooectioless datagram service that ifers best-efirt delivery, which meaos that 

UDP dies oit guaraotee delivery ir verify sequeociog fir aoy datagrams. A siurce hist that oeeds 

reliable cimmuoicatio must use either TCP ir a prigram that privides its iwo sequeociog aod 

ackoiwledgmeot services. 

Question 15 

Which layer if the OSI midel ciotrils the reliability if cimmuoicatios betweeo oetwirk devices 

usiog fiw ciotril, sequeociog aod ackoiwledgmeots? 

A. Physical 

B. Data-liok 

C. Traospirt 

D. Netwirk 

Explaoatio: 

Aoswern C 



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