[Free] 2017(July) EnsurePass Examcollection Cisco 100-105 Dumps with VCE and PDF 161-170

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Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

Question No: 161 – (Topic 5)

How can you ensure that only the MAC address of a server is allowed by switch port Fa0/1?

  1. Configure port Fa0/1 to accept connections only from the static IP address of the server.

  2. Configure the server MAC address as a static entry of port security.

  3. Use a proprietary connector type on Fa0/1 that is incomputable with other host

    connectors.

  4. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.

Answer: B Explanation:

When the MAC address is configured as static entry, no other address is allowed.

Question No: 162 – (Topic 5)

Refer to the exhibit.

image

Host A can communicate with Host B but not with Hosts C or D. How can the network administrator solve this problem?

  1. Configure Hosts C and D with IP addresses in the 192.168.2.0 network.

  2. Install a router and configure a route to route between VLANs 2 and 3.

  3. Install a second switch and put Hosts C and D on that switch while Hosts A and B remain on the original switch.

  4. Enable the VLAN trunking protocol on the switch.

Answer: B Explanation:

Two VLANs require a router in between otherwise they cannot communicate. Different VLANs and different IP subnets need a router to route between them.

Question No: 163 – (Topic 5)

The network administrator has found the following problem.

image

The remote networks 172.16.10.0, 172.16.20.0, and 172.16.30.0 are accessed through the Central router#39;s serial 0/0 interface. No users are able to access 172.16.20.0. After reviewing the command output shown in the graphic, what is the most likely cause of the problem?

  1. no gateway of last resort on Central

  2. Central router#39;s not receiving 172.16.20.0 update

  3. incorrect static route for 172.16.20.0

  4. 172.16.20.0 not located in Central#39;s routing table

Answer: C Explanation:

If we use 172.16.20.0 to route to 172.16.150.15, then the packet will route back. To clear this error we have to use #no ip route 172.16.20.0 255.255.255.0 172.16.150.15 command in configuration mode.

Question No: 164 – (Topic 5)

Refer to the exhibit.

image

The network administrator is testing connectivity from the branch router to the newly installed application server. What is the most likely reason for the first ping having a success rate of only 60 percent?

  1. The network is likely to be congested, with the result that packets are being

    intermittently dropped.

  2. The branch router had to resolve the application server MAC address.

  3. There is a short delay while NAT translates the server IP address.

  4. A routing table lookup delayed forwarding on the first two ping packets.

  5. The branch router LAN interface should be upgraded to FastEthernet.

Answer: B Explanation:

Initially the MAC address had to be resolved, but once it is resolved and is in the ARP table of the router, pings go through immediately.

Question No: 165 – (Topic 5)

Refer to the exhibit.

image

Serial 0/0 does not respond to a ping request from a host on the FastEthernet 0/0 LAN. How can this problem be corrected?

  1. Enable the Serial 0/0 interface.

  2. Correct the IP address for Serial 0/0.

  3. Correct the IP address for FastEthernet 0/0

  4. Change the encapsulation type on Serial 0/0

  5. Enable autoconfiguration on the Serial 0/0 interface

Answer: A Explanation:

Serial 0/0 interface is administratively down therefore, you will have to run the quot;no shutdownquot; command to enable the interface for data.

Question No: 166 – (Topic 5)

Why would a network administrator configure port security on a switch?

  1. to prevent unauthorized Telnet access to a switch port

  2. to prevent unauthorized hosts from accessing the LAN

  3. to limit the number of Layer 2 broadcasts on a particular switch port

  4. block unauthorized access to the switch management interfaces

Answer: B Explanation:

You can use the port security feature to restrict input to an interface by limiting and identifying MAC addresses of the stations allowed to access the port. When you assign secure MAC addresses to a secure port, the port does not forward packets with source addresses outside the group of defined addresses. If you limit the number of secure MAC addresses to one and assign a single secure MAC address, the workstation attached to that port is assured the full bandwidth of the port.

If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, when the MAC address of a station attempting to access the port is different from any of the identified secure MAC addresses, a security violation occurs. Also, if a station with a secure MAC address configured or learned on one secure port attempts to access another secure port, a violation is flagged.

Question No: 167 – (Topic 5)

Refer to the exhibit.

image

A TFTP server has recently been installed in the Atlanta office. The network administrator is located in the NY office and has made a console connection to the NY router. After establishing the connection they are unable to backup the configuration file and IOS of the NY router to the TFTP server. What is the cause of this problem?

  1. The NY router has an incorrect subnet mask.

  2. The TFTP server has an incorrect IP address.

  3. The TFTP server has an incorrect subnet mask.

  4. The network administrator computer has an incorrect IP address.

Answer: C Explanation:

The TFTP server is using a mask of 255.255.255.240 (/28) while the router is configured with a /29. Because of this, the Atlanta router does not see the TFTP server as being in the same subnet.

Question No: 168 – (Topic 5)

Refer to the exhibit.

image

After configuring two interfaces on the HQ router, the network administrator notices an error message. What must be done to fix this error?

  1. The serial interface must be configured first.

  2. The serial interface must use the address 192.168.1.2

  3. The subnet mask of the serial interface should be changed to 255.255.255.0

  4. The subnet mask of the FastEthernet interface should be changed to 255.255.255.240

  5. The address of the FastEthernet interface should be changed to 192.168.1.66

Answer: D Explanation:

The IP address 192.168.1.17 255.255.255.0 specifies that the address is part of the 192.168.1.0/24 subnet

24 mask bits = 255.255.255.0

28 mask bits = 255.255.255.240

192.168.1.0/24 subnet has a host range of 192.168.1.1 to 192.168.1.254 (0 being network and 255 being broadcoast)

192.168.1.17/28 subnet has a host range of 192.168.1.17 to 192.168.1.30 (16 being network and 31 being broadcast)

192.168.1.65/28 subnet has a host range of 192.168.1.65 – 192.168.1.78 (64 being network and 79 being broadcast)

if fa0/0 was left as /24, you can see that the host range includes the host range of 192.168.1.64/28 which conflicts. Simply speaking, you can#39;t overlap the subnets. By changing the subnet mask of fa0/0 to 255.255.255.240, these networks would no longer overlap.

Question No: 169 – (Topic 5)

image

image

image

What is the bandwidth on the WAN interface of Router 1?

  1. 16 Kbit/sec

  2. 32 Kbit/sec

  3. 64 Kbit/sec

  4. 128 Kbit/sec

  5. 512 Kbit/sec

  6. 1544 Kbit/sec

Answer: A Explanation:

Use the 鈥渟how interface s0/0鈥?to see the bandwidth set at 16 Kbit/sec.

The show interface s0/0 command results will look something like this and the bandwidth will be represented by the quot;BWquot; on the fourth line as seen below where BW equals 1544 Kbits/sec.

R2#show interface serial 0/0 Serial0/0 is up, line protocol is down Hardware is GT96K Serial

Internet address is 10.1.1.5/30

MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 uses.

Question No: 170 – (Topic 5)

Refer to the exhibit.

image

A network administrator is troubleshooting a connectivity problem on the serial interfaces. The output from the show interfaces command on both routers shows that the serial interface is up, line protocol is down. Given the partial output for the show running-config in the exhibit, what is the most likely cause of this problem?

  1. The serial cable is bad.

  2. The MTU is incorrectly configured.

  3. The Layer 2 framing is misconfigured.

  4. The IP addresses are not in the same subnet.

Answer: C Explanation:

Here we see that Rtr3 is configured to use PPP encapsulation, but Rtr1 has not been configured for any kind of encapsulation. The default on Cisco router serial interfaces is HDLC, not PPP, so there is an encapsulation mismatch.

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