100-105 | The Secret of Cisco 100-105 pdf

Q6. Refer to the exhibit.

An administrator replaced the 10/100 Mb NIC in a desktop PC with a 1 Gb NIC and now the PC will not connect to the network. The administrator began troubleshooting on the switch. Using the switch output shown, what is the cause of the problem?

A. Speed is set to 100Mb/s.

B. Input flow control is off.

C. Encapsulation is set to ARPA.

D. The port is administratively down.

E. The counters have never been cleared.

Answer: A

Explanation:

For PC to switch connectivity, the speed settings must match. In this case, the 1 Gb NIC will not be able to communicate with a 100Mb fast Ethernet interface, unless the 1Gb NIC can be configured to connect at 100Mb.

Q7. Scenario

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.

An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem?

A. There is an area ID mismatch.

B. There is a PPP authentication issue; the username is not configured on R3 and R6.

C. There is an OSPF hello and dead interval mismatch.

D. The R3 router ID is configured on R6.

Answer: D

Explanation:

Using the show running-config command we see that R6 has been incorrectly configured with the same router ID as R3 under the router OSPF process.

Q8. A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

A. the OSPF route

B. the EIGRP route

C. the RIPv2 route

D. all three routes

E. the OSPF and RIPv2 routes

Answer: B

Explanation:

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative

Distances of popular routing protocols are listed below:

Q9. Refer to the output of the corporate router routing table shown in the graphic.

The corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3.

What will the router do with this packet?

A. It will encapsulate the packet as Frame Relay and forward it out interface Serial 0/0.117.

B. It will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0.

C. It will forward the packet out interface Serial 0/1 and send an ICMP Echo Reply message out interface serial 0/0.102.

D. It will change the IP packet to an ARP frame and forward it out FastEthernet 0/0.

Answer: B

Explanation:

Since the destination network is not in the routing table, and no default gateway has been configured, the router will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0. It knows to send it out Fa 0/0 because the routing table for the source IP address of 192.168.214.20 shows it was learned from the Fa 0/0 interface.

Q10. The network administrator has found the following problem.

The remote networks 172.16.10.0, 172.16.20.0, and 172.16.30.0 are accessed through the Central router'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?

A. no gateway of last resort on Central

B. Central router's not receiving 172.16.20.0 update

C. incorrect static route for 172.16.20.0

D. 172.16.20.0 not located in Central'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.

Q11. Refer to the exhibit.

What two things can the technician determine by successfully pinging from this computer to the IP address 172.16.236.1? (Choose two)

A. The network card on the computer is functioning correctly.

B. The default static route on the gateway router is correctly configured.

C. The correct default gateway IP address is configured on the computer.

D. The device with the IP address 172.16.236.1 is reachable over the network.

E. The default gateway at 172.16.236.1 is able to forward packets to the internet.

Answer: A,D

Explanation:

The source and destination addresses are on the same network therefore, a default gateway is not necessary for communication between these two addresses.

Q12. Which two of these statements are true of IPv6 address representation? (Choose two.)

A. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

B. A single interface may be assigned multiple IPv6 addresses of any type.

C. Every IPv6 interface contains at least one loopback address.

D. The first 64 bits represent the dynamically created interface ID.

E. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

Answer: B,C

Explanation:

A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).

Every IPv6-enabled interface must contain at least one loopback and one link-local address.

Optionally, every interface can have multiple unique local and global addresses. IPv6 host addresses can be assigned in multiple ways:

Static configuration Stateless autoconfiguration DHCPv6

When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to generate the 64-bit interface ID for the host. This is called the EUI-64 address.

Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits required.

Reference: http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf

Q13. How many addresses will be available for dynamic NAT translation when a router is configured with the following commands?

Router(config)#ip nat pool TAME 209.165.201.23 209.165.201.30 netmask 255.255.255.224

Router(config)#ip nat inside source list 9 pool TAME

A. 7

B. 8

C. 9

D. 10

E. 24

F. 32

Answer: B

Explanation:

209.165.201.23 to 209.165.201.30 provides for 8 addresses.

Q14. What does the "Inside Global" address represent in the configuration of NAT?

A. the summarized address for all of the internal subnetted addresses

B. the MAC address of the router used by inside hosts to connect to the Internet

C. a globally unique, private IP address assigned to a host on the inside network

D. a registered address that represents an inside host to an outside network

Answer: D

Explanation:

NAT: Local and Global Definitions http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094837. shtml

Cisco defines these terms as:

Inside local addressu2014The IP address assigned to a host on the inside network. This is the address configured as a parameter of the computer OS or received via dynamic address allocation protocols such as DHCP. The address is likely not a legitimate IP address assigned by the Network Information Center (NIC) or service provider.

Inside global addressu2014A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world.

Outside local addressu2014The IP address of an outside host as it appears to the inside network. Not necessarily a legitimate address, it is allocated from an address space routable on the inside.

Outside global addressu2014The IP address assigned to a host on the outside network by the host owner.

The address is allocated from a globally routable address or network space.

These definitions still leave a lot to be interpreted. For this example, this document redefines these terms by first defining local address and global address. Keep in mind that the terms inside and outside are NAT definitions. Interfaces on a NAT router are defined as inside or outside with the NAT configuration commands, ip nat inside destination and ip nat outside source . Networks to which these interfaces connect can then be thought of as inside networks or outside networks, respectively.

Local addressu2014A local address is any address that appears on the inside portion of the network.

Global addressu2014A global address is any address that appears on the outside portion of the network.

Q15. Refer to the exhibit.

HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point?

A. abcd.1123.0045

B. 192.168.7.17

C. aabb.5555.2222

D. 192.168.1.1

E. abcd.2246.0035

Answer: E

Explanation:

For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto.