SEMESTR 3 - FINAL

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28 Οκτ 2013 (πριν από 3 χρόνια και 7 μήνες)

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SEMESTR 3
-

FINAL


1



Refer to the graphic. Which of the following commands would be used on the router to provide communication
between the two hosts connected to the switch?


interface vlan 2

ip address 192.168.2.1 255.255.255.0

no shutdown

interface vl
an 3

ip address 192.168.3.1 255.255.255.0

no shutdown


*** interface fastethernet 0/0

no shutdown

interface fastethernet 0/0.2

encapsulation dot1q 2

ip address 192.168.2.1 255.255.255.0

interface fastethernet 0/0.3

encapsulation dot1q 3

ip address 192.168.
3.1 255.255.255.0


interface vlan 2

switchport mode trunk dot1q

interface vlan 3

switchport mode trunk dot11


interface fastethernet 0/0

mode trunk dot1q 2 3

ip address 192.168.2.1 255.255.255.0



2



Refer to the graphic. If the switches are new and have
been cabled as shown, which switch will become the root
bridge?


*** SC


CE


JB


JP


JN


cannot be determined from the information given



3

A switch is operating in VTP client mode. What is true about the operations that can be performed by the switch?


V
LANs that are created are not included in advertisements.


*** It can only adopt VLAN changes advertised from a VTP server.


It advertises topology changes out all trunk ports.


It can modify existing VLANs, but can not create new ones.


It can create and
modify VLANs, but can not delete existing ones.



4

Why would a network administrator choose to enable authentication for OSPF exchanges? (Choose two.)


*** to prevent routing information from being falsified


to reduce OSPF information exchange overhead


to assure that OSPF routing information takes priority over RIP or IGRP updates


to encrypt routing tables to prevent unauthorized viewing


*** to ensure that routing information comes from a valid source



5

A network administrator asked an assistant to r
emove several VLANs from a switch. When the assistant entered in
the no vlan 1 command an error was received. What was the cause of the error?


VLANs can not be deleted until all ports have been removed from the VLAN assignment.


VLANs can only be deleted
by the user that created them.


VLAN 1 can not be deleted until another VLAN has been assigned its duties.


*** VLAN1 is the management VLAN by default and can not be deleted.


The command was not entered properly, which caused a syntax error to occur.



6

Employees of XYZ Company connect their laptop computers to the office LAN using Ethernet ports. The Cisco
switches used in the company network are configured with port security. At which layer of the three
-
layer design
model do these switches operate?


ph
ysical


distribution


data link


*** access


core



7



Refer to the graphic. What will be the result of DR elections in the network presented in the graphic using OSPF?
(Choose three.)


RTC will be DR of the 10.5.0.0/24 network.


*** RTD will be DR of the

10.5.0.0/24 network.


RTA will be DR of the 10.4.0.0/24 network.


*** RTD will be DR of the 10.4.0.0/24 network.


*** RTB will be DR of the 10.7.0.0/24 network.


RTD will be DR of the 10.7.0.0/24 network.



8

Which of the following statements is true when

VTP is configured on a switched network that incorporates VLANs?


VTP is only compatible with the 802.1Q standard.


VTP adds to the complexity of managing a switched network.


All VTP hello packets are routed through VLAN 1 interfaces.


*** Changes made t
o the network can be communicated to all switches dynamically.



9

Which of the following tasks must be completed to configure a router interface to serve the newly added network
192.168.10.64/27 and to advertise this network over RIP v2? (Choose three.)


*** RIP v2 must be configured with the network command and the IP network number for the new network.


RIP v2 must be configured with the network command and the IP host address and subnet mask for the newly
activated interface.


The router must be configu
red with the ip subnet
-
zero command so that this network can be added and advertised.


*** A network host address and subnet mask must be applied to the newly activated interface.


*** The routing protocol must be activated with the router rip and version
2 commands.


RIP v2 must be configured on the other enterprise routers with an entry for the newly added network.



10

Which layer of the hierarchical three
-
layer design model combines traffic from multiple IDFs?


access


backbone


*** distribution


core



11

A company has been assigned three Class C addresses and requires the use of supernetting in its addressing scheme.
Which routing protocol could be used to configure the company routers to support supernetting? (Choose two.)


*** a classless routing pro
tocol


a classful routing protocol


*** OSPF


IGRP


RIP v1



12



Refer to the graphic. What does the mode of FORWARDING mean in the spanning
-
tree process?


*** The switch is sending and receiving frames.


The switch is receiving frames, but cannot send fr
ames.


The switch is participating in an election process.


The switch is only receiving BPDUs, not data, and is not sending any type of frames.



13



Refer to the graphic. The network administrator has determined that RTRA needs to be the DR because it i
s the
more powerful router. Which of the following commands would be used to control the election process?


RTRA(config)# interface fastethernet 0/0

RTRA(config
-
if)# ospf priority 0


*** RTRA(config)# interface fastethernet 0/0

*** RTRA(config
-
if)# ip ospf

priority 255


RTRA(config)# ospf priority 1


RTRA(config)# ip ospf priority 255


RTRA(config)# interface fastethernet 0/0

RTRA(config
-
if)# ip ospf priority 0



14

Which device provides connectivity between IP routed networks and subnetworks?


switch


brid
ge


*** router


active hub



15

Which statements describe features of full
-
duplex Ethernet? (Choose three.)


*** allows packets to be received and sent simultaneously by a host


requires a minimum of two wires


*** reduces the number of collisions


allocat
es between 60 and 80 percent of available bandwidth in both directions


*** allocates 100 percent of the bandwidth in both directions


increases the number of broadcast domains



16



Refer to the graphic. Both routers are configured using RIP v1. Both rou
ters are sending updates about the directly
connected routes. R1 can successfully ping the serial interface of R2. The routing table on R1 does not contain any
dynamically learned routes from R2, and the routing table on R2 shows no dynamically learned rou
tes from R1.
What is the problem?


Subnetting is not supported by RIP v1.


One of the routers needs a clock rate on the serial interface.


CIDR is not supported by RIP v1.


*** VLSM is not supported by RIP v1.



17



The network administrator shown in the
graphic is connected to Switch3 using a LAN Ethernet connection. The
administrator needs to verify configuration settings on the newly installed Switch2. What actions must the
administrator take to access Switch2 with a web browser? (Choose three.)


Config
ure the hostname on Switch2.


*** Activate the HTTP service on Switch2.


Set the management VLAN password.


*** Configure IP addressing parameters on Switch2.


*** Establish host connectivity to Switch2.



18



Refer to the graphic. Router A and C are comp
letely configured and the administrator needs to configure the routing
protocol on Router B so that communication occurs throughout the network. Which of the following commands
configures routing on Router B?


B(config)# router eigrp 1

B(config)# network 1
92.168.10.0 0.0.0.3

B(config)# network 192.168.10.4 0.0.0.3

B(config)# network 192.168.10.128 0.0.0.192


B(config)# router eigrp 1

B(config)# network 192.168.10.0 0.0.0.3 area 0

B(config)# network 192.168.10.4 0.0.0.3 area 0

B(config)# network 192.168.10.1
28 0.0.0.192 area 0


B(config)# router eigrp 1

B(config)# network 192.168.10.0 0.0.0.3 no
-
summary

B(config)# network 192.168.10.4 0.0.0.3 no
-
summary

B(config)# network 192.168.10.128 0.0.0.192 no
-
summary


*** B(config)# router eigrp 1

*** B(config
-
router)#

network 192.168.10.0



19



Refer to the graphic. If the network is running OSPF, which subnetworks can be assigned to the serial links between
Router2 and the other routers shown in the diagram?


192.1.1.4/30 and 192.1.1.8/30


192.1.1.32/30 and 192.1.1.1
60/30


192.1.1.96/30 and 192.1.1.100/30


192.1.1.160/30 and 192.1.1.164/30


*** 192.1.1.192/30 and 192.1.1.196/30



20

Which of the following are attributes of link
-
state routing protocols? (Choose three.)


Periodic updates are sent every 120 seconds to ne
ighboring routers.


Each router sends its entire routing table to neighboring routers.


*** Routers send updates when a change in the network is detected.


*** Link
-
state protocols converge more rapidly than distance vector protocols.


After convergence, l
ink
-
state protocols use more bandwidth than distance vector protocols use.


*** Link
-
state protocols are less prone to routing loops than distance vector protocols.



21



Which command configures the static address shown in the graphic?


Switch1(config)#m
ac
-
address
-
table entry 00e0.2917.1884 VLAN 1 fastethernet 04


Switch1(config
-
if)#mac
-
address
-
table entry static 00e0.2917.1884 VLAN 1 fastethernet 04


Switch1(config)#mac
-
address
-
table entry 00e0.2917.1884 fastethernet interface 0/4 VLAN 1


*** Switch1(con
fig)#mac
-
address
-
table static 00e0.2917.1884 interface fastethernet 0/4 VLAN 1


Switch1(config
-
if)#mac
-
address
-
table static 00e0.2917.1884 VLAN 1 fastethernet 04



22

The following command was added to a router's configuration: ip route 192.168.20.0 255.25
5.255.0 172.16.15.3.
What will adding this command accomplish? (Choose two.)


A default route will be created.


*** A static route will be created.


*** Information about the 192.168.20.0 network learned dynamically will be ignored as long as the static ro
ute
exists.


All packets with an unknown destination address will be forwarded out interface 192.168.20.245.


The route will be added as a RIP route in the routing table.



23



Refer to the graphic. Switch 2 has computers attached that belong to VLAN 2. S
witch 3 has computers attached that
belong to VLAN 3. Switch 1 is a Cisco 2926G Layer 3 switch that has a route module installed. Switch 1 provides
connectivity to the other switches and is used to route between the VLANs. At which layer of the three
-
layer

switch
design model does Switch 1 operate?


physical


data link


core


access


network


*** distribution



24



Which command is used to obtain the information presented in the above graphic?


show vlan ifindex


show vlan id


*** show vlan brief


show run
ning
-
config



25



Refer to the graphic. Two Catalyst switches with ports configured for VLANs 3 and 4 are connected. The hosts on
SW
-
A and SW
-
B need to communicate with one another. Which of the following commands is used to configure
Port 1 on SW
-
B? Note

that SW
-
B Port 1 used to have a host connected to it before the switch was connected to SW
-
A.


(config)# interface vlan 1

(config
-
subif)# ip address 192.168.10.1 255.255.255.0

(config
-
subif)# no shutdown


(config)# interface fastethernet 0/1

(config
-
if)#
vlan 1 trunk

(config
-
if)# switchport mode trunk dot1q


*** (config)# interface fastethernet 0/1

*** (config
-
if)# switchport mode trunk


(config)# interface vlan 1

(config
-
subif)# switchport mode trunk dot1q



26

How do EIGRP routers actively maintain neigh
bor relationships?


by the exchange of hello packets with neighboring routers


by dynamically learning new routes from neighbors


by the exchange of neighbor tables with directly attached routers


by comparing known routes to received updates


*** by the e
xchange of routing tables with directly attached routers


by continuously monitoring the status of the router ports



27

What is the first step in the spanning
-
tree process?


elect a designated switch


use a router to locate a default gateway


*** elect a

root bridge


determine the path cost of each active port on the switch



28



Refer to the graphic. Which commands would direct outbound traffic from R1 to the ISP and inbound traffic from
the ISP to network 200.1.1.0?


R1(config)# ip route 144.1.1.0 255.
255.255.192 serial 0/0

ISP(config)# ip route 0.0.0.0 0.0.0.0 serial 0/1


R1(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0

ISP(config)# ip route 0. 0.0.0 0.0.0.0 serial 0/0


*** R1(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0

*** ISP(config)# ip route 200.1.
1.0 255.255.255.0 serial 0/1


R1(config)# ip route 144.1.1.0 255.255.255.192 serial 0/0

ISP(config)# ip route 200.1.1.0 255.255.255.0 serial 0/1



29

Which switching method increases latency and reliability more than any other method?


cut
-
through


fast
-
fo
rward


fragment
-
free


*** store
-
and
-
forward



30



Consider the networks shown in the graphic. Which of the following is the correct configuration for Router B if
OSPF is being used as the routing protocol?


B(config)# router ospf 0

B(config
-
router)# netwo
rk 10.10.10.64 0.0.0.31 area 0

B(config
-
router)# network 10.10.10.0 0.0.0.3 area 0


B(config)# router ospf 1

B(config
-
router)# network 10.10.10.64 0.0.0.63 area 0

B(config
-
router)# network 10.10.10.0 0.0.0.3 area 0


B(config)# router ospf 99

B(config
-
route
r)# network 10.10.10.64 255.255.255.224 area 0

B(config
-
router)# network 10.10.10.0 255.255.255.248 area 0


*** B(config)# router ospf 1

*** B(config
-
router)# network 10.10.10.64 0.0.0.31 area 0

*** B(config
-
router)# network 10.10.10.0 0.0.0.3 area 0



31

What does a constant amber SYSTEM LED indicate on a Catalyst switch?


The switch is going through POST.


The switch is in the process of initializing ports.


The switch has failed POST.


*** The switch has passed POST and is working properly.



32



Refer
to the graphic. What is the first parameter used to determine which switch is selected as the root bridge in the
spanning
-
tree process?


highest Layer 2 address


highest priority number


highest path cost


lowest Layer 2 address


*** lowest priority number


lowest path cost



33

A network administrator is having problems with excessive collisions on the corporate network. If the network
currently uses hubs, what is the most cost effective way to reduce collisions?


add additional hubs


*** replace hubs with

switches


replace hubs with access points


add a router to every hub segment



34



One part of the network shown in the graphic uses IGRP and another part uses EIGRP. Which statement is true
about this network?


IP traffic will not be routable from netw
ork 192.168.1.0 to network 10.1.1.0.


The autonomous system number in the IGRP network must be converted to an EIGRP autonomous system number.


*** The route to network 192.168.1.0 will be tagged as external by the EIGRP routers.


The IGRP router will clas
sify routes learned from the EIGRP routers as internal.


The IGRP router will not detect EIGRP routers.


EIGRP is not backward compatible and the IGRP routes will not be detected.



35

Which of the following features do RIPv1 and RIPv2 have in common? (Cho
ose three.)


*** hop count as a metric


classless routing


*** use split horizon


*** maximum hop count is 15


broadcast updates


no authentication



36

When configuring the networks that need to be advertised on a router using EIGRP, which of the followin
g can be
configured on the router? (Choose three.)


*** the network number


subnet mask


*** wildcard mask


process number


area ID


*** autonomous system number



37



Refer to the graphic. The host on VLAN 2 cannot communicate with the host on VLAN 3. Wh
ich of the following
could be the problem based on the output of the show interface fastethernet 0/1 command from the switch?


The switch port 1 is not set to access mode.


*** The router interface connected to switch port 1 is shut down.


The router is no
t configured for trunking.


The switch port is not configured for full duplex or a speed of 100 Mbps.



38



Refer to the graphic above. The network has stabilized and SW
-
F has been elected root bridge of the STP tree.
Network traffic indicates that SW
-
A w
ould be a better selection for the root bridge. How can the network
administrator accomplish this task?


change the bridge priority of SW
-
F to a lower value


change the bridge priority of SW
-
F to a higher value


*** change the bridge priority of SW
-
A to a
lower value


change the bridge priority of SW
-
A to a higher value



39



Refer to the graphic. Which of the following commands is used to configure switch port 2 for the host on VLAN 2?


*** (config)# interface fastethernet 0/2

*** (config
-
if)# switchport
mode access

*** (config
-
if)# switchport access vlan 2


(config)# interface vlan 2

(config
-
subif)# switchport mode access 2


(config)# interface vlan 2

(config
-
subif)# switchport mode trunk dot1q


(config)# interface fastethernet 0/2

(config
-
if)# vlan 2



4
0

Which of the following statements are true about routers that are running EIGRP? (Choose three.)


*** They can support multiple routed protocols.


They can support only link
-
state protocols.


They send their entire routing tables to neighboring routers.


*** They send partial routing updates in response to topology changes.


They send routing updates to all other routers in the network.


*** They use hello packets to inform neighboring routers of their status.



41



A network administrator located at the

East site needs to check the configuration of a switch located at the Corporate
site. The show hosts command is entered on the East router but does not produce any output. Which command can
be used to gain access to the Corporate LAN switch assuming the s
witch is assigned the IP address 172.16.15.5/24?


dial Corporate 172.16.15.5


line vty 0 4

telnet


telnet Corporate


*** telnet 172.16.15.5



42



What is an advantage of building a network such as the one shown in the graphic?


*** provides multiple paths

for connectivity in the event of link failure


provides alternate routes when spanning tree has a problem


provides alternate network routes when the Spanning Tree Protocol is converging


provides concurrent paths for faster data transfers



43



What typ
e of connectivity (refer to point A in the graphic) is required between SW1 and SW2? Note that SW1 has
VLANs 2, 3, 4, and 5 configured and SW2 has VLANs 5, 6, 7, and 8 configured. Also, the computers on the same
VLAN need the ability to communicate with on
e another.


access


channel


interVLAN


intraVLAN


*** trunk



44



Refer to the graphic and the following configurations from the routers. Router A is not receiving any OSPF routes
from the other routers. Based on the Router A and Router B configurations,

what is the problem?


A# show running
-
config

--
output omitted
--

interface Fastethernet 0/0

ip address 192.168.10.65 255.255.255.192

interface Serial 0/0

ip address 192.168.10.2 255.255.255.252

clockrate 64000

router ospf 1

network 192.168.10.0 0.0.0.3 are
a 0

network 192.168.10.64 0.0.0.63 area 0


B# show running
-
config

--
output omitted
--

interface Fastethernet 0/0

ip address 192.168.10.129 255.255.255.192

interface Serial0/0

ip address 192.168.10.2 255.255.255.252

interface Serial0/1

ip address 192.168.10.
5 255.255.255.252

clockrate 56000

router ospf 2

network 192.168.10.0 0.0.0.3 area 0

network 192.168.10.4 0.0.0.3 area 0

network 192.168.10.128 0.0.0.63 area 0


*** duplicate IP address


mismatched OSPF process IDs


mismatched OSPF timers


mismatched clock
rates



45



Refer to the graphic. Routers A and B are running EIGRP and Router C is running IGRP. Which of the following is
necessary for Router C to automatically see routes from Routers A and B?


Routers B and C must use the same autonomous system numbe
r, but Router A can use a different autonomous
system number.


*** Routers A, B, and C must all use the same autonomous system number.


Routers B and C must both use the redistribute igrp as_number command.


No commands are necessary. EIGRP routes are alwa
ys seen by IGRP routers.



46

Which of the following is true about Spanning Tree Protocol? (Choose two.)


eliminates physical loops in network topologies


*** eliminates logical loops in network topologies


can only be used in networks where routers are in
stalled


*** can only be used in networks where switches are incorporated into the design


can only be used in networks where both routers and switches are used



47

A company with the address 192.168.3.0 needs an address scheme that supports ten networks
with a maximum of
seven hosts per segment. The network administrator wants to use VLSM for the most efficient use of addresses.
What is a valid address to assign to one of the LAN links?


192.168.3.192


*** 192.168.3.209


192.168.3.223


192.168.3.225


192.
168.3.235



48

Which of the following commands can be used to configure the default management VLAN on a Cisco Catalyst
switch?


(config)# interface fastethernet 0/1

(config
-
if)# ip address 10.0.0.1 255.255.255.0

(config
-
if)# no shutdown


*** (config)# int
erface vlan 1

*** (config
-
subif)# ip address 10.0.0.3 255.255.255.0

*** (config
-
subif)# no shutdown


(config)# interface management vlan

(config
-
subif)# ip address 10.0.0.3 255.255.255.0

(config
-
subif)# no shutdown


(config)# interface fastethernet 0/1

(co
nfig
-
if)# switchport mode vlan 1

(config
-
if)# no shutdown



49

When should EIGRP automatic summarization be turned off?


when a router has not discovered a neighbor within three minutes


when a router has more than three active interfaces


*** when a route
r has discontiguous networks attached


when a router has less than five active interfaces



50



Consider the network shown in the graphic. Which of the following IP addresses would be valid for a company that
is leasing a single Class C network address an
d using VLSM for maximum efficiency?


200.1.1.64 /26 for the 50 users

200.1.1.128 /27 for the 25 users

200.1.1.176 /27 for the 10 users

200.1.1.192 /30 for one pair of serial links

200.1.1.196 /30 for the second pair of serial links


200.1.1.0 /26 for the
50 users

200.1.1.80 /27 for the 25 users

200.1.1.96 /27 for the 10 users

200.1.1.128 /30 for one pair of serial links

200.1.1.132 /30 for the second pair of serial links


*** 200.1.1.64 /26 for the 50 users

*** 200.1.1.128 /27 for the 25 users

*** 200.1.1.
160 /28 for the 10 users

*** 200.1.1.176 /30 for one pair of serial links

*** 200.1.1.180 /30 for the second pair of serial links


200.1.1.0 /26 for the 50 users

200.1.1.64 /26 for the 25 users

200.1.1.128 /27 for the 10 users

200.1.1.192 /30 for one pair
of serial links

200.1.1.192 /30 for the second pair of serial links