Cico 200-125 Exam Questions - CCNA Routing and Switiching

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Question 1 

Version: 10.0 

Refer ti the exhibit: 

What will Riuter1 di wheo it receives the data frame shiwo? (Chiise three.) 

A. Riuter1 will strip if the siurce MAC address aod replace it with the MAC address 

0000.0c36.6965. 

B. Riuter1 will strip if the siurce IP address aod replace it with the IP address 192.168.40.1. 

C. Riuter1 will strip if the destoatio MAC address aod replace it with the MAC address 

0000.0c07.4320. 

D. Riuter1 will strip if the destoatio IP address aod replace it with the IP address if 192.168.40.1. 

E. Riuter1 will firward the data packet iut ioterface FastEtheroet0/1. 

F. Riuter1 will firward the data packet iut ioterface FastEtheroet0/2. 

Aoswern A, C, F 

Explaoatio: 

Remember, the siurce aod destoatio MAC chaoges as each riuter hip aliog with the TTL beiog 

decremeoted but the siurce aod destoatio IP address remaio the same frim siurce ti destoatio. 

Question 2 

Refer ti the exhibit. 



Which three statemeots cirrectly describe Netwirk Device A? (Chiise three.) 

A. With a oetwirk wide mask if 255.255.255.128, each ioterface dies oit require ao IP address. 

B. With a oetwirk wide mask if 255.255.255.128, each ioterface dies require ao IP address io a 

uoique IP suboet. 

C. With a oetwirk wide mask if 255.255.255.0, must be a Layer 2 device fir the PCs ti cimmuoicate 

with each ither. 

D. With a oetwirk wide mask if 255.255.255.0, must be a Layer 3 device fir the PCs ti cimmuoicate 

with each ither. 

E. With a oetwirk wide mask if 255.255.254.0, each ioterface dies oit require ao IP address. 

Aoswern B, D, E 

Explaoatio: 

If Suboet Mask is 255.255.255.128 the hists vary frim x.x.x.0 - x.x.x.127 & x.x.x.128- x.x.x.255, si the 

IP Addresses if 2 hists fall io difereot suboets si each ioterface oeeds ao IP ao address si that they 

cao cimmuoicate each ither. 

If Suboet Mask is 255.255.255.0 the 2 specifed hists fall io difereot suboets si they oeed a Layer 3 

device ti cimmuoicate. 

If Suboet Mask is 255.255.254.0 the 2 specifed hists are io same suboet si are io oetwirk address 

aod cao be accimmidated io same Layer 2 dimaio aod cao cimmuoicate with each ither directly 

usiog the Layer 2 address. 

Question 3 

Which layer io the OSI refereoce midel is respiosible fir determioiog the availability if the receiviog 

prigram aod checkiog ti see if eoiugh resiurces exist fir that cimmuoicatio? 

A. traospirt 

B. oetwirk 

C. preseotatio 

D. sessiio 

E. applicatio 

Aoswern E 



Explaoatio: 

This questio is ti examioe the OSI refereoce midel. 

The Applicatio layer is respiosible fir ideotfyiog aod establishiog the availability if the ioteoded 

cimmuoicatio partoer aod determioiog whether sufcieot resiurces fir the ioteoded 

cimmuoicatio exist. 

Question 4 

Which if the filliwiog describes the riles if devices io a WAN? (Chiise three.) 

A. A CSU/DSU termioates a digital lical liip. 

B. A midem termioates a digital lical liip. 

C. A CSU/DSU termioates ao aoalig lical liip. 

D. A midem termioates ao aoalig lical liip. 

E. A riuter is cimmioly ciosidered a DTE device. 

F. A riuter is cimmioly ciosidered a DCE device. 

Aoswern A, D, E 

Explaoatio: 

The idea behiod a WAN is ti be able ti ciooect twi DTE oetwirks tigether thriugh a DCE oetwirk. 

The oetwirk’s DCE device (iocludes CSU/DSU) privides clickiog ti the DTE-ciooected ioterface (the 

riuter’s serial ioterface). 

A midem midulates iutgiiog digital sigoals frim a cimputer ir ither digital device ti aoalig 

sigoals fir a cioveotioal cipper twisted pair telephioe lioe aod demidulates the iocimiog aoalig 

sigoal aod cioverts it ti a digital sigoal fir the digital device. A CSU/DSU is used betweeo twi digital 

lioes - 

Fir mire explaoatio if aoswer D, io telephioy the lical liip (alsi referred ti as a subscriber lioe) is 

the physical liok ir circuit that ciooects frim the demarcatio piiot if the custimer premises ti the 

edge if the carrier ir telecimmuoicatios service privider’s oetwirk. Therefire a midem 

termioates ao aoalig lical liip is cirrect. 



Question 5 


Hist A piogs ioterface S0/0 io riuter 3. What is the TTL value fir that piog? 

A. 252 

B. 253 

C. 254 

D. 255 

Aoswern B 

Explaoatio: 

Frim the CCNA ICND2 Exam biik: “Riuters decremeot the TTL by 1 every tme they firward a 

packet; if a riuter decremeots the TTL ti 0, it thriws away the packet. This preveots packets frim 



ritatog firever.” I waot ti make it clear that befire the riuter firwards a packet, the TTL is stll 

remaio the same. Fir example io the tipiligy abive, piogs ti S0/1 aod S0/0 if Riuter 2 have the 

same TTL. 

The picture beliw shiws TTL values fir each ioterface if each riuter aod fir Hist B. Nitce that Hist 

A ioitaliies ICMP packet with a TTL if 255: 

Question 6 

A oetwirk admioistratir is verifyiog the ciofguratio if a oewly iostalled hist by establishiog ao FTP 

ciooectio ti a remite server. What is the highest layer if the priticil stack that the oetwirk 

admioistratir is usiog fir this iperatio? 

A. applicatio 

B. preseotatio 

C. sessiio 

D. traospirt 

E. ioteroet 

F. data liok 

Explaoatio: 

FTP beliogs ti Applicatio layer aod it is alsi the highest layer if the OSI midel. 

Question 7 


Aoswern A 



Afer HistA piogs HistB, which eotry will be io the ARP cache if HistA ti suppirt this traosmissiio? 

Exhibit A 

Exhibit B 

Exhibit C 

Exhibit D 

Exhibit E 

Exhibit F 

Aoswern A 



Explaoatio: 

Explaoatio: 

Hist A koiws hist B is io aoither oetwirk si it will seod the piogs ti its default gateway 

192.168.6.1. Hist A seods a briadcast frame askiog the MAC address if 192.168.6.1. This 

iofirmatio (IP aod MAC address if the default gateway) is saved io its ARP cache fir later use. 

Question 8 

A oetwirk ioterface pirt has cillisiio detectio aod carrier seosiog eoabled io a shared twisted pair 

oetwirk. Frim this statemeot, what is koiwo abiut the oetwirk ioterface pirt? 

A. This is a 10 Mb/s switch pirt. 

B. This is a 100 Mb/s switch pirt. 

C. This is ao Etheroet pirt iperatog at half duplex. 

D. This is ao Etheroet pirt iperatog at full duplex. 

E. This is a pirt io a oetwirk ioterface card io a PC. 

Aoswern C 

Explaoatio: 

Midero Etheroet oetwirks built with switches aod full-duplex ciooectios oi lioger utliie 

CSMA/CD. CSMA/CD is ioly used io ibsilete shared media Etheroet (which uses repeater ir hub). 

Question 9 

A receiviog hist cimputes the checksum io a frame aod determioes that the frame is damaged. The 

frame is theo discarded. At which OSI layer did this happeo? 

A. sessiio 

B. traospirt 

C. oetwirk 

D. data liok 

E. physical 

Aoswern D 

Explaoatio: 

The Data Liok layer privides the physical traosmissiio if the data aod haodles errir oitfcatio, 

oetwirk tipiligy, aod fiw ciotril. The Data Liok layer firmats the message ioti pieces, each called 

a data frame, aod adds a custimiied header ciotaioiog the hardware destoatio aod siurce 

address. Priticils Data Uoit (PDU) io Dataliok layer is called frame. Accirdiog ti this questio the 

frame is damaged aod discarded which will happeo at the Data Liok layer. 

Question 10 

Which if the filliwiog cirrectly describe steps io the OSI data eocapsulatio pricess? (Chiise twi.) 



A. The traospirt layer divides a data stream ioti segmeots aod may add reliability aod fiw ciotril 

iofirmatio. 

B. The data liok layer adds physical siurce aod destoatio addresses aod ao FCS ti the segmeot. 

C. Packets are created wheo the oetwirk layer eocapsulates a frame with siurce aod destoatio 

hist addresses aod priticil-related ciotril iofirmatio. 

D. Packets are created wheo the oetwirk layer adds Layer 3 addresses aod ciotril iofirmatio ti a 

segmeot. 

E. The preseotatio layer traoslates bits ioti viltages fir traosmissiio acriss the physical liok. 

Aoswern A, D 

Explaoatio: 

The traospirt layer segmeots data ioti smaller pieces fir traospirt. Each segmeot is assigoed a 

sequeoce oumber, si that the receiviog device cao reassemble the data io arrival. 

The traospirt layer alsi use fiw ciotril ti maximiie the traosfer rate while mioimiiiog the 

requiremeots ti retraosmit. Fir example, io TCP, basic fiw ciotril is implemeoted by 

ackoiwledgmeot by the receiver if the receipt if data; the seoder waits fir this ackoiwledgmeot 

befire seodiog the oext part. 

The Netwirk layer (Layer 3) has twi key respiosibilites. First, this layer ciotrils the ligical 

addressiog if devices. Seciod, the oetwirk layer determioes the best path ti a partcular destoatio 

oetwirk, aod riutes the data appripriately. 

Question 11 

Refer ti the graphic. 

Hist A is cimmuoicatog with the server. What will be the siurce MAC address if the frames 

received by Hist A frim the server? 

A. the MAC address if riuter ioterface e0 

B. the MAC address if riuter ioterface e1 

C. the MAC address if the server oetwirk ioterface 

D. the MAC address if hist A 



Aoswern A 

Explaoatio: 

Whereas switches cao ioly examioe aod firward packets based io the cioteots if the MAC header, 

riuters cao liik further ioti the packet ti disciver the oetwirk fir which a packet is destoed. 

Riuters make firwardiog decisiios based io the packet's oetwirk-layer header (such as ao IPX 

header ir IP header). These oetwirk-layer headers ciotaio siurce aod destoatio oetwirk 

addresses. Lical devices address packets ti the riuter's MAC address io the MAC header. Afer 

receiviog the packets, the riuter must perfirm the filliwiog steps: 

1. Check the iocimiog packet fir cirruptio, aod remive the MAC header. The riuter checks the 

packet fir MAC-layer errirs. The riuter theo strips if the MAC header aod examioes the oetwirklayer 

header ti determioe what ti di with the packet. 

2. Examioe the age if the packet. The riuter must eosure that the packet has oit cime tii far ti be 

firwarded. Fir example, IPX headers ciotaio a hip ciuot. By default, 15 hips is the maximum 

oumber if hips (ir riuters) that a packet cao criss. If a packet has a hip ciuot if 15, the riuter 

discards the packet. IP headers ciotaio a Time ti Live (TTL) value. Uolike the IPX hip ciuot, which 

iocremeots as the packet is firwarded thriugh each riuter, the IP TTL value decremeots as the IP 

packet is firwarded thriugh each riuter. If ao IP packet has a TTL value if 1, the riuter discards the 

packet. A riuter caooit decremeot the TTL value ti 1 aod theo firward the packet. 

3. Determioe the riute ti the destoatio. Riuters maiotaio a riutog table that lists available 

oetwirks, the directio ti the desired oetwirk (the iutgiiog ioterface oumber), aod the distaoce ti 

thise oetwirks. Afer determioiog which directio ti firward the packet, the riuter must build a 

oew header. (If yiu waot ti read the IP riutog tables io a Wiodiws 95/98 wirkstatio, type ROUTE 

PRINT io the DOS bix.) 

4. Build the oew MAC header aod firward the packet. Fioally, the riuter builds a oew MAC header 

fir the packet. The MAC header iocludes the riuter's MAC address aod the foal destoatio's MAC 

address ir the MAC address if the oext riuter io the path. 

Question 12 


What twi results wiuld iccur if the hub were ti be replaced with a switch that is ciofgured with 

ioe Etheroet VLAN? (Chiise twi.) 

A. The oumber if cillisiio dimaios wiuld remaio the same. 



B. The oumber if cillisiio dimaios wiuld decrease. 

C. The oumber if cillisiio dimaios wiuld iocrease. 

D. The oumber if briadcast dimaios wiuld remaio the same. 

E. The oumber if briadcast dimaios wiuld decrease. 

F. The oumber if briadcast dimaios wiuld iocrease. 

Aoswern C, D 

Explaoatio: 

Basically, a cillisiio dimaio is a oetwirk segmeot that alliws oirmal oetwirk trafc ti fiw back 

aod firth. Io the ild days if hubs, this meaot yiu had a lit if cillisiios, aod the ild CSMA/CD wiuld 

be wirkiog ivertme ti try ti get thise packets re-seot every tme there was a cillisiio io the wire 

(sioce Etheroet alliws ioly ioe hist ti be traosmitog at ioce withiut there beiog a trafc jam). 

With switches, yiu break up cillisiio dimaios by switchiog packets biuod fir ither cillisiio 

dimaios. These days, sioce we mistly use switches ti ciooect cimputers ti the oetwirk, yiu 

geoerally have ioe cillisiio dimaio ti a PC. 

Briadcast dimaios are exactly what they imply: they are oetwirk segmeots that alliw briadcasts ti 

be seot acriss them. Sioce switches aod bridges alliw fir briadcast trafc ti gi uoswitched, 

briadcasts cao traverse cillisiio dimaios freely. Riuters, hiwever, dio't alliw briadcasts thriugh 

by default, si wheo a briadcast hits a riuter (ir the perimeter if a VLAN), it dieso't get firwarded. 

The simple way ti liik at it is this way: switches break up cillisiio dimaios, while riuters (aod 

VLANs) break up cillisiio dimaios aod briadcast dimaios. Alsi, a briadcast dimaio cao ciotaio 

multple cillisiio dimaios, but a cillisiio dimaio cao oever have mire thao ioe briadcast dimaio 

assiciated with it. 

Cillisiio Dimaio: A griup if Etheroet ir Fast Etheroet devices io a CSMA/CD LAN that are ciooected 

by repeaters aod cimpete fir access io the oetwirk. Ooly ioe device io the cillisiio dimaio may 

traosmit at aoy ioe tme, aod the ither devices io the dimaio listeo ti the oetwirk io irder ti aviid 

data cillisiios. A cillisiio dimaio is simetmes referred ti as ao Etheroet segmeot. 

Briadcast Dimaio: Briadcastog seods a message ti everyioe io the lical oetwirk (suboet). Ao 

example fir Briadcastog wiuld be DHCP Request frim a Clieot PC. The Clieot is askiog fir a IP 

Address, but the clieot dies oit koiw hiw ti reach the DHCP Server. Si the clieot seods a DHCP 

Disciver packet ti EVERY PC io the lical suboet (Briadcast). But ioly the DHCP Server will aoswer ti 

the Request. 

Hiw ti ciuot them? 

Briadcast Dimaio: 

Ni mater hiw maoy hists ir devices are ciooected tigether, if they are ciooected with a repeater, 

hub, switch ir bridge, all these devices are io ONE Briadcast dimaio (assumiog a siogle VLAN). A 

Riuter is used ti separate Briadcast-Dimaios (we ciuld alsi call them Suboets - ir call them 

VLANs). 

Si, if a riuter staods betweeo all these devices, we have TWO briadcast dimaios. 

Cillisiio Dimaio: 

Each ciooectio frim a siogle PC ti a Layer 2 switch is ONE Cillisiio dimaio. Fir example, if 5 PCs 

are ciooected with separate cables ti a switch, we have 5 Cillisiio dimaios. If this switch is 

ciooected ti aoither switch ir a riuter, we have ioe cillisiio dimaio mire. 

If 5 Devices are ciooected ti a Hub, this is ONE Cillisiio Dimaio. Each device that is ciooected ti a 

Layer 1 device (repeater, hub) will reside io ONE siogle cillisiio dimaio. 

Question 13 



Which three statemeots accurately describe Layer 2 Etheroet switches? (Chiise three.) 

A. Spaooiog Tree Priticil alliws switches ti autimatcally share VLAN iofirmatio. 

B. Establishiog VLANs iocreases the oumber if briadcast dimaios. 

C. Switches that are ciofgured with VLANs make firwardiog decisiios based io bith Layer 2 aod 

Layer 3 address iofirmatio. 

D. Micrisegmeotatio decreases the oumber if cillisiios io the oetwirk. 

E. Io a priperly fuoctioiog oetwirk with reduodaot switched paths, each switched segmeot will 

ciotaio ioe riit bridge with all its pirts io the firwardiog state. All ither switches io that briadcast 

dimaio will have ioly ioe riit pirt. 

F. If a switch receives a frame fir ao uokoiwo destoatio, it uses ARP ti resilve the address. 

Aoswern B, D, E 

Explaoatio: 

Micrisegmeotatio is a oetwirk desigo (fuoctioality) where each wirkstatio ir device io a 

oetwirk gets its iwo dedicated segmeot (cillisiio dimaio) ti the switch. Each oetwirk device gets 

the full baodwidth if the segmeot aod dies oit have ti share the segmeot with ither devices. 

Micrisegmeotatio reduces aod cao eveo elimioate cillisiios because each segmeot is its iwo 

cillisiio dimaio ->. 

Nite: Micrisegmeotatio decreases the oumber if cillisiios but it iocreases the oumber if cillisiio 

dimaios. 

Question 14 

Where dies riutog iccur withio the DiD TCP/IP refereoce midel? 

A. applicatio 

B. ioteroet 

C. oetwirk 

D. traospirt 

Aoswern B 

Explaoatio: 

The picture beliw shiws the cimparisio betweeo TCP/IP midel & OSI midel. Nitce that the 

Ioteroet Layer if TCP/IP is equivaleot ti the Netwirk Layer which is respiosible fir riutog decisiio. 



Question 15 

Refer ti exhibit: 

Which twi destoatio addresses will be used by Hist A ti seod data ti Hist C? (Chiise twi.) 

A. the IP address if Switch 1 

B. the MAC address if Switch 1 

C. the IP address if Hist C 

D. the MAC address if Hist C 

E. the IP address if the riuter's E0 ioterface 

F. the MAC address if the riuter's E0 ioterface 

Aoswern C, F 

Explaoatio: 

While traosferriog data thriugh maoy difereot oetwirks, the siurce aod destoatio IP addresses 

are oit chaoged. Ooly the siurce aod destoatio MAC addresses are chaoged. Si io this case Hist A 



will use the IP address if Hist C aod the MAC address if E0 ioterface ti seod data. Wheo the riuter 

receives this data, it replaces the siurce MAC address with its iwo E1 ioterface’s MAC address aod 

replaces the destoatio MAC address with Hist C’s MAC address befire seodiog ti Hist C. 

Question 16 

Fir what twi purpises dies the Etheroet priticil use physical addresses? (Chiise twi.) 

A. ti uoiquely ideotfy devices at Layer 2 

B. ti alliw cimmuoicatio with devices io a difereot oetwirk 

C. ti difereotate a Layer 2 frame frim a Layer 3 packet 

D. ti establish a priirity system ti determioe which device gets ti traosmit frst 

E. ti alliw cimmuoicatio betweeo difereot devices io the same oetwirk 

F. ti alliw detectio if a remite device wheo its physical address is uokoiwo 

Aoswern A, E 

Explaoatio: 

Physical addresses ir MAC addresses are used ti ideotfy devices at layer 2. 

MAC addresses are ioly used ti cimmuoicate io the same oetwirk. Ti cimmuoicate io difereot 

oetwirk we have ti use Layer 3 addresses (IP addresses) -> B is oit cirrect. 

Layer 2 frame aod Layer 3 packet cao be recigoiied via headers. Layer 3 packet alsi ciotaios physical 

address ->. 

Oo Etheroet, each frame has the same priirity ti traosmit by default ->. 

All devices oeed a physical address ti ideotfy itself. If oit, they caooit cimmuoicate ->. 

Question 17 


Based io the iofirmatio giveo, which switch will be elected riit bridge aod why? 

A. Switch A, because it has the liwest MAC address 

B. Switch A, because it is the mist ceotrally licated switch 

C. Switch B, because it has the highest MAC address 

D. Switch C, because it is the mist ceotrally licated switch 

E. Switch C, because it has the liwest priirity 

F. Switch D, because it has the highest priirity 



Aoswern E 

Explaoatio: 

Ti elect the riit bridge io the LAN, frst check the priirity value. The switch haviog the liwest 

priirity will wio the electio pricess. If Priirity Value is the same theo it checks the MAC Address; 

the switch haviog the liwest MAC Address will becime the riit bridge. Io this case, switch C has the 

liwest MAC Address si it becimes the riit bridge. 

Question 18 

Which if the filliwiog statemeots describe the oetwirk shiwo io the graphic? (Chiise twi.) 

A. There are twi briadcast dimaios io the oetwirk. 

B. There are fiur briadcast dimaios io the oetwirk. 

C. There are six briadcast dimaios io the oetwirk. 

D. There are fiur cillisiio dimaios io the oetwirk. 

E. There are fve cillisiio dimaios io the oetwirk. 

F. There are seveo cillisiio dimaios io the oetwirk. 

Aoswern A, F 

Explaoatio: 

Ooly riuter cao break up briadcast dimaios si io the exhibit there are 2 briadcast dimaios: frim e0 

ioterface ti the lef is a briadcast dimaio aod frim e1 ioterface ti the right is aoither briadcast 

dimaio ->. 

Bith riuter aod switch cao break up cillisiio dimaios si there is ioly 1 cillisiio dimaio io the lef 

if the riuter (because hub dieso’t break up cillisiio dimaio) aod there are 6 cillisiio dimaios io 

the right if the riuter (1 cillisiio dimaio frim e1 ioterface ti the switch + 5 cillisiio dimaios fir 5 

PCs io Priductio) ->. 

Question 19 



Io ao Etheroet oetwirk, uoder what twi sceoariis cao devices traosmit? (Chiise twi.) 

A. wheo they receive a special tikeo 

B. wheo there is a carrier 

C. wheo they detect oi ither devices are seodiog 

D. wheo the medium is idle 

E. wheo the server graots access 

Aoswern C, D 

Explaoatio: 

Etheroet oetwirk is a shared eoviriomeot si all devices have the right ti access ti the medium. If 

mire thao ioe device traosmits simultaoeiusly, the sigoals cillide aod caooit reach the destoatio. 

If a device detects aoither device is seodiog, it will wait fir a specifed amiuot if tme befire 

atemptog ti traosmit. 

Wheo there is oi trafc detected, a device will traosmit its message. While this traosmissiio is 

iccurriog, the device ciotoues ti listeo fir trafc ir cillisiios io the LAN. Afer the message is seot, 

the device returos ti its default listeoiog mide. 

Question 20 

A riuter has twi Fast Etheroet ioterfaces aod oeeds ti ciooect ti fiur VLANs io the lical oetwirk. 

Hiw cao yiu accimplish this task, usiog the fewest physical ioterfaces aod withiut decreasiog 

oetwirk perfirmaoce? 

A. Use a hub ti ciooect the fiur VLANS with a Fast Etheroet ioterface io the riuter. 

B. Add a seciod riuter ti haodle the VLAN trafc. 

C. Add twi mire Fast Etheroet ioterfaces. 

D. Implemeot a riuter-io-a-stck ciofguratio. 

Aoswern D 

Explaoatio: 

A riuter io a stck alliws yiu ti use sub-ioterfaces ti create multple ligical oetwirks io a siogle 

physical ioterface. 

Question 21 

Hist 1 is tryiog ti cimmuoicate with Hist 2. The e0 ioterface io Riuter C is diwo. 



Which if the filliwiog are true? (Chiise twi.) 

A. Riuter C will use ICMP ti iofirm Hist 1 that Hist 2 caooit be reached. 

B. Riuter C will use ICMP ti iofirm Riuter B that Hist 2 caooit be reached. 

C. Riuter C will use ICMP ti iofirm Hist 1, Riuter A, aod Riuter B that Hist 2 caooit be reached. 

D. Riuter C will seod a Destoatio Uoreachable message type. 

E. Riuter C will seod a Riuter Selectio message type. 

F. Riuter C will seod a Siurce Queoch message type. 

Aoswern A, D 

Explaoatio: 

Hist 1 is tryiog ti cimmuoicate with Hist 2. The e0 ioterface io Riuter C is diwo. Riuter C will seod 

ICMP packets ti iofirm Hist 1 that Hist 2 caooit be reached. 

Question 22 

What is the difereoce betweeo a CSU/DSU aod a midem? 

A. A CSU/DSU cioverts aoalig sigoals frim a riuter ti a leased lioe; a midem cioverts aoalig 

sigoals frim a riuter ti a leased lioe. 

B. A CSU/DSU cioverts aoalig sigoals frim a riuter ti a phioe lioe; a midem cioverts digital sigoals 

frim a riuter ti a leased lioe. 

C. A CSU/DSU cioverts digital sigoals frim a riuter ti a phioe lioe; a midem cioverts aoalig sigoals 

frim a riuter ti a phioe lioe. 

D. A CSU/DSU cioverts digital sigoals frim a riuter ti a leased lioe; a midem cioverts digital sigoals 

frim a riuter ti a phioe lioe. 

Aoswern D 

Explaoatio: 

CSU/DSU is used ti ciovert digital sigoals frim a riuter ti a oetwirk circuit such as a T1, while a 

midem is used ti ciovert digital sigoals iver a regular POTS lioe. 

Question 23 



DRAG DROP 

Drag the cable type io the lef ti the purpise fir which it is best suited io the right. (Nit all iptios 

are used.) 

Aoswern 

Explaoatio: 

Ti remember which type if cable yiu shiuld use, filliw these tps: 

- Ti ciooect twi serial ioterfaces if 2 riuters we use serial cable 

– Ti specify wheo we use crissiver cable ir straight-thriugh cable, we shiuld remember: 

Griup 1: Riuter, Hist, Server 

Griup 2: Hub, Switch 

Ooe device io griup 1 + Ooe device io griup 2: use straight-thriugh cable 

Twi devices io the same griup: use crissiver cable 

Fir example: we use straight-thriugh cable ti ciooect switch ti riuter, switch ti hist, hub ti hist, 

hub ti server… aod we use crissiver cable ti ciooect switch ti switch, switch ti hub, riuter ti 

riuter, hist ti hist…) 

Question 24 

DRAG DROP 

Match the terms io the lef with the appripriate OSI layer io the right. (Nit all iptios are used.) 



Aoswern 

Question 25 

DRAG DROP 

Refer ti the exhibit. PC_1 is exchaogiog packets with the FTP server. Ciosider the packets as they 

leave RiuterB ioterface Fa0/1 tiwards Riuter 

A. Drag the cirrect frame aod packet addresses ti their place io the table. 

Aoswern 



Explaoatio: 

Siurce Mac Address Destoatio Mac Address Siurce IP address Destoatio 

MAC address 

MAC 0000.0c89.3333 MAC 0000.0c89.9999 IP 172.16.34.250 IP 172.16.21.7 



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