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CCNA 3 Scaling Networks Chapter 5 v5.0 Exam Answers 2015 100%

Thứ Năm, 18 tháng 12, 2014

A network administrator has just changed the router ID on a router that is working in an OSPFv2 environment. What should the administrator do to reset the adjacencies and use the new router ID?
Issue the clear ip ospf process privileged mode command.*
Configure the network statements.
Change the OSPFv2 process ID.
Change the interface priority.
2

Refer to the exhibit. What three conclusions can be drawn from the displayed output? (Choose three.)
The DR can be reached through the GigabitEthernet 0/0 interface.*
There have been 9 seconds since the last hello packet sent.*
The router ID on the DR router is 3.3.3.3
The BDR has three neighbors.
The router ID values were not the criteria used to select the DR and the BDR.*
This interface is using the default priority.

When checking a routing table, a network technician notices the following entry:
O*E2 0.0.0.0/0 [110/1] via 192.168.16.3, 00:20:22, Serial0/0/0
What information can be gathered from this output?
This route is a propagated default route.*
The edge of the OSPF area 0 is the interface that is addressed 192.168.16.3.
The route is located two hops away.
The metric for this route is 110.

Which command will a network engineer issue to verify the configured hello and dead timer intervals on a point-to-point WAN link between two routers that are running OSPFv2?
show ipv6 ospf interface serial 0/0/0
show ip ospf neighbor
show ip ospf interface serial 0/0/0*
show ip ospf interface fastethernet 0/1

A network engineer has manually configured the hello interval to 15 seconds on an interface of a router that is running OSPFv2. By default, how will the dead interval on the interface be affected?
The dead interval will not change from the default value.
The dead interval will now be 30 seconds.
The dead interval will now be 15 seconds.
The dead interval will now be 60 seconds.*
6

Refer to the exhibit. An administrator is trying to configure R1 to run OSPFv3 but the neighbor adjacency is not forming with the router connected to Fa0/0. What is the cause of the problem?
FastEthernet0/0 has been configured as a passive interface.
No router ID has been configured.*
A link-local address has not been configured on interface FastEthernet0/0.
The OSPF process ID and area values are backwards in the interface configuration.
7

Refer to the exhibit. A network administrator has configured the OSPF timers to the values that are shown in the graphic. What is the result of having those manually configured timers?
The R1 dead timer expires between hello packets from R2.*
The neighbor adjacency has formed.
R1 automatically adjusts its own timers to match the R2 timers.
The hello timer on R2 expires every ten seconds.

When OSPFv2 neighbors are establishing adjacencies, in which state do they elect a DR and BDR router?
Two-Way state*
Loading state
Init state
Exchange state
9
Refer to the exhibit. R1 and R2 are connected to the same LAN segment and are configured to run OSPFv3. They are not forming a neighbor adjacency. What is the cause of the problem?
The OSPFv3 process IDs of R1 and R2 are different.
The priority value of both R1 and R2 is 1.
The timer intervals of R1 and R2 do not match.*
The IPv6 addresses of R1 and R2 are not in the same subnet.
10

Refer to the exhibit. What kind of OSPF authentication has been configured on this interface?
null
simple
MD5*
plain text
11 
Why is MD5 authentication more secure than simple authentication for OSPF updates?
MD5 does not send the password to the neighbor router.*
MD5 requires passwords that are at least 8 characters long.
MD5 uses both a username and a password to authenticate the neighbor.
MD5 employs IPsec to keep the updates from being intercepted.
12 
Which two pieces of information are used by the OSPF MD5 algorithm to generate a signature? (Choose two.)
OSPF router ID
secret key*
router hostname
interface IP address
OSPF message*
13 
A network engineer is troubleshooting convergence and adjacency issues in an OSPFv2 network and has noted that some expected network route entries are not displayed in the routing table. Which two commands will provide additional information about the state of router adjacencies, timer intervals, and the area ID? (Choose two.)
show running-configuration
show ip ospf neighbor*
show ip ospf interface*
show ip route ospf
show ip protocols
14 
Why do OSPF serial interfaces usually require manual bandwidth configuration?
OSPF uses the bandwidth value to compute routes for its routing table.*
All serial interfaces default to a value of 1.544 Mb/s.
Each side of an OSPF serial link should be configured with a unique value.
Bandwidth value affects the actual speed of the link.
15 
A network engineer is troubleshooting an OSPFv2 network and discovers that two routers connected by a point-to-point WAN serial link are not establishing an adjacency. The OSPF routing process, network commands and area ID are all confirmed as correct, and the interfaces are not passive. Testing shows that the cabling is correct, that the link is up, and pings between the interfaces are successful. What is most likely the problem?
A clock rate has not been set on the DCE interface of the serial link.
The OSPFv2 process IDs on each router do not match.
A DR election has not taken place.
The subnet masks on the two connected serial interfaces do not match.*
16 
A network engineer is troubleshooting OSPFv2 routing issues on two connected routers. Which two requirements to form an adjacency need to be verified? (Choose two.)
Verify that the interfaces that connect the two routers are in the same area.*
Verify that one of the routers is the DR or BDR and the other router a DRother.
Verify that one of the interfaces that connects the two routers is active and the other passive.
Verify that the interfaces that connect the two routers are in the same subnet.*
Verify that both routers are using the same OSPFv2 process ID.
17 
Which command is used to verify that OSPF is enabled and also provides a list of the networks that are being advertised by the network?​
show ip protocols*
show ip ospf interface
show ip interface brief
show ip route ospf
18

Refer to the exhibit. Four routers are connected to an Ethernet LAN segment and are configured to run OSPFv3. However, none of the routers are receiving routing updates. What is the cause of the problem?
The routers are using IPv6 link local addresses to communicate.
The network type has been set to BROADCAST instead of NBMA.
The routers are using IPv4 addresses for router IDs.
All of the routers have an OSPFv3 interface priority of 0.*
19

Refer to the exhibit. These two routers are configured to run OSPFv3 but they are not forming a neighbor adjacency. What is the cause of the problem?
The routers do not have global IPv6 addresses that are configured on the Fa0/0 interfaces.
The routers have both been elected as the DR.
The routers are configured with the same router ID.*
The routers have the same priority.
20 
A network engineer suspects that OSPFv3 routers are not forming neighbor adjacencies because there are interface timer mismatches. Which two commands can be issued on the interface of each OSFPv3 router to resolve all timer mismatches? (Choose two.)
no ipv6 ospf dead-interval*
no ipv6 router ospf 10
ip ospf dead-interval 40
no ipv6 ospf hello-interval*
no ipv6 ospf cost 10
ip ospf hello-interval 10
21

Refer to the exhibit. Fill in the blank. Do not use abbreviations.
The command ” show ipv6 route ” can be issued on router R2 to verify the propagation of a static default route from R1 to R2.
22 
Fill in the blank. Do not use abbreviations.
When IPv4 and OSPFv2 are being used, the command “ show ip ospf neighbor ” is used to verify that a router has formed an adjacency with its neighboring routers.
23
Place the options in the following order:
- not scored -
full state
loading state
ExStart state
24
Place the options in the following order: 
[+] third 
[+] second 
– not scored – 
[+] first 
[+] fourth
[+] Order does not matter within this group.
Read more ...

CCNA 3 Scaling Networks Chapter 4 v5.0 Exam Answers 2015 100%

Thứ Ba, 16 tháng 12, 2014
1
Launch PT   Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
What is the SSID of the connected network and which message is displayed in the browser window?
SSID: Home-Network
Message: Well done!​
SSID: Home-Network
Message: Good job!
SSID: Home-Net
Message:Congratulations! You did it!​
SSID: Home-Net
Message:Congratulations! You were able to connect it! *

A administrator wishes to extend the range of the existing IEEE 802.11n network without changing the AP. What can the administrator do to accomplish this?
Change to WPA2 authentication.
Deploy a Wi-Fi Range Extender.*
Split the wireless traffic between the 802.11n 2.4 GHz band and the 5 GHz band.
Upgrade the firmware on the AP.

Which security mode is the least secure choice when a home wireless router is configured?
WPA
WEP*
WPA2-Personal
WPA2

Which two roles are typically performed by a wireless router that is used in a home or small business? (Choose two.)
RADIUS authentication server
repeater
access point*
WLAN controller
Ethernet switch*

Which organization certifies vendors for adherence to the 802.11 standards to improve interoperability of 802.11 products?
IEEE
FCC
ITU-R
Wi-Fi Alliance*

Which feature of 802.11n wireless access points allows them to transmit data at faster speeds than previous versions of 802.11 Wi-Fi standards did?
MITM
SPS
MIMO*
WPS

Which type of wireless topology is created when two or more Basic Service Sets are interconnected by Ethernet?
ESS*
BSS
IBISS
ad hoc WLAN
WiFi Direct

If three 802.11b access points need to be deployed in close proximity, which three frequency channels should be used? (Choose three.)
1*
3
5
6*
8
11*

What type of wireless antenna is best suited for providing coverage in large open spaces, such as hallways or large conference rooms?
Yagi
omnidirectional*
directional
dish
10 
Which three Wi-Fi standards operate in the 2.4GHz range of frequencies? (Choose three.)
802.11b*
802.11n*
802.11ac
802.11a
802.11g*
11 
What is the purpose of the Distributed Coordination Function in an IEEE 802.11 WLAN environment?
It is used to send data over a half-duplex connection.
It is used in a full-duplex environment to detect collisions.
It allows a client to detect whether or not a channel is clear prior to transmission.*
It allows the client to change transmission channels.
12 
An employee connects wirelessly to the company network using a cell phone. The employee then configures the cell phone to act as a wireless access point that will allow new employees to connect to the company network. Which type of security threat best describes this situation?
rogue access point*
spoofing
cracking
denial of service
13 
During which stage of establishing connectivity between a WLAN client and an AP does the client learn the MAC address of the AP?
encryption
authentication
discovery
association*
probing
14 
Fill in the blank. Do not use abbreviations.
Ad hoc wireless topologies sometimes can use a feature called ”  tethering   ” to enable a smartphone to create a personal hotspot.
15 
What is an advantage of SSID cloaking?​
It is the best way to secure a wireless network.
Clients will have to manually identify the SSID to connect to the network.​*
SSIDs are very difficult to discover because APs do not broadcast them.​
It provides free Internet access in public locations where knowing the SSID is of no concern.
16 
A student uses a laptop to upload an assignment to a file server. Which wireless frame type did the laptop send to locate and associate with the campus access point?
data frame
beacon frame
management frame*
control frame
17 
Which type of management frame may regularly be broadcast by an AP?
authentication
beacon*
probe response
probe request
18 
A company has recently implemented an 802.11n wireless network. Some users are complaining that the wireless network is too slow. Which solution is the best method to enhance the performance of the wireless network?
Disable DHCP on the access point and assign static addresses to the wireless clients.
Replace the wireless NICs on the computers that are experiencing slow connections.
Split the traffic between the 2.4 GHz and 5 GHz frequency bands.*
Upgrade the firmware on the wireless access point.
19 
For which discovery mode will an AP generate the most traffic on a WLAN?
open mode
passive mode*
active mode
mixed mode
20 
Which statement defines the control frame operation between two stations?
After receiving a data frame, the receiving station will send an ACK frame to the sending station if no errors are found.​*
A station responds to an RTS frame with an ACK frame, thus providing permission for the requesting station to send a data frame.​
If the sending station does not receive an ACK frame within a predetermined period of time, the sending station will drop the connection.​
A station sends an RTS frame as the first step in a three-way handshake that is required before sending data frames.
21 
What is a difference between Cisco APs that operate in a home environment and Cisco APs that operate in a corporate environment?
Some corporate AP models can operate in either autonomous mode or controller-based mode.*
Controller-based APs are used in the corporate environment, and they are server-dependent devices that require an initial configuration to operate.
Autonomous APs are used only in the home environment, and they incorporate the functions of a router, switch, and AP into one device.​
Cisco corporate APs do not support PoE.
22
Place the options in the following order: 
– not scored – 
MITM 
spoofed disconnct DoS 
CTS flood DoS
23
Place the options in the following order: 
– not scored – 
Step 2 
Step 5 
Step 1 
Step 3 
– not scored – 
Step 4
Read more ...

CCNA 3 Scaling Networks Chapter 2 v5.0 Exam Answers 2015 100%

Thứ Hai, 15 tháng 12, 2014

Which protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard?
STP
Rapid PVST+
PVST+
MST*

Which two types of spanning tree protocols can cause suboptimal traffic flows because they assume only one spanning-tree instance for the entire bridged network? (Choose two.)
STP*
RSTP*
MSTP
Rapid PVST+
PVST+
3

Refer to the exhibit. Which protocol information is being displayed in the output?
HSRP
VRRP
GLBP*
FHRP

A network administrator is preparing the implementation of Rapid PVST+ on a production network. How are the Rapid PVST+ link types determined on the switch interfaces?
Link types can only be configured on access ports configured with a single VLAN.
Link types must be configured with specific port configuration commands.
Link types are determined automatically.*
Link types can only be determined if PortFast has been configured.

Which RSTP ports are connected to end devices?
root ports
designated ports
trunk ports
edge ports*

If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?
highest IP address
lowest MAC address*
lowest IP address
highest MAC address

Which port state will switch ports immediately transition to when configured for PortFast?
learning
blocking
forwarding*
listening

To obtain an overview of the spanning tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information will this command display? (Choose two.)
The role of the ports in all VLANs.*
The IP address of the management VLAN interface.
The number of broadcasts received on each root port.
The status of native VLAN ports.
The root bridge BID.*
9
Launch PT    Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
Which switch is the root bridge?​
Switch_1
Switch_2
Switch_4*
Switch_3
10 
Fill in the blank. Do not use abbreviations.
The spanning-tree ” mode rapid-pvst ” global configuration command is used to enable Rapid PVST+.
11 
Which STP priority configuration would ensure that a switch would always be the root switch?
spanning-tree vlan 10 root primary
spanning-tree vlan 10 priority 4096
spanning-tree vlan 10 priority 0*
spanning-tree vlan 10 priority 61440
12 
Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?
VRRPv2*
SLB
GLBP
HSRP
13 
Fill in the blank.
In FHRP operation, two or more routers are represented as a single ” virtual ” router.
14 
Which three components are combined to form a bridge ID?
extended system ID*
MAC address*
port ID
IP address
cost
bridge priority*
15 
What is a characteristic of a Layer 2 loop?
A switch is continually forwarding the same unicast frame.
Broadcast frames are forwarded back to the sending switch.*
Routers continually forward packets to other routers.
The Time-to-Live attribute of a frame is set to infinity.
16 
Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)
redundant links between Layer 2 switches*
removing single points of failure with multiple Layer 2 switches*
link-state dynamic routing that provides redundant routes
static default routes
implementing VLANs to contain broadcasts
17 
What additional information is contained in the 12-bit extended system ID of a BPDU?
MAC address
VLAN ID*
port ID
IP address
18 
What is an advantage of PVST+?
PVST+ optimizes performance on the network through load sharing.*
PVST+ requires fewer CPU cycles for all the switches in the network.
PVST+ reduces bandwidth consumption compared to traditional implementations of STP that use CST.
PVST+ optimizes performance on the network through autoselection of the root bridge.
19 
What is the purpose of HSRP?
It prevents malicious hosts from connecting to trunk ports.
It enables an access port to immediately transition to the forwarding state.
It prevents a rogue switch from becoming the STP root.
It provides a continuous network connection when a router fails.*
20 
In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)
listening
learning*
forwarding*
disabled
blocking
21

Place the options in the following order: 
Step 4 
– not scored – 
Step 3 
Step 1 
Step 2
22

Refer to the exhibit. A network engineer is troubleshooting host connectivity on a LAN that uses a first hop redundancy protocol. Which IPv4 gateway address should be configured on the host?
192.168.2.0
192.168.2.1
192.168.2.2
192.168.2.100*
23 
What is the outcome of a Layer 2 broadcast storm?
CSMA/CD will cause each host to continue transmitting frames.
ARP broadcast requests are returned to the transmitting host.
Routers will take over the forwarding of frames as switches become congested.
New traffic is discarded by the switch because it is unable to be processed.*
Read more ...

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