Cisco 100-101 Online Practice Questions and Exam Preparation

Cisco 100-101 Online Questions & Answers

• Question 121:

  If an Ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?

  A. 1024
  B. 2046
  C. 4094
  D. 4096
  E. 8190
  C. 4094

  ---

  Each octet represents eight bits. The bits, in turn, represent (from left to right): 128, 64, 32 , 16 , 8, 4, 2, 1 Add them up and you get 255. Add one for the all zeros option, and the total is 256. Now take away one of these for the network

  address (all zeros) and another for the broadcast address (all ones). Each octet represents 254 possible hosts. Or 254 possible networks. Unless you have subnet zero set on your network gear, in which case you could conceivably have 255.

  The CIDR addressing format (/20) tells us that 20 bits are used for the network portion, so the maximum number of networks are 2^20 minus one if you have subnet zero enabled, or minus 2 if not.

  You asked about the number of hosts. That will be 32 minus the number of network bits, minus two. So calculate it as (2^(32-20))-2, or (2^12)-2 = 4094

• Question 122:

  Refer to the exhibit.

  

  The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch. What two operations will the switch perform when it receives this frame? (Choose two.)

  A. The switch will not forward a frame with this destination MAC address.
  B. The MAC address of 0000.00aa.aaaa will be added to the MAC Address Table.
  C. The MAC address of ffff.ffff.ffff will be added to the MAC address table.
  D. The frame will be forwarded out all active switch ports except for port fa0/0.
  E. The frame will be forwarded out fa0/0 and fa0/1 only.
  F. The frame will be forwarded out all the ports on the switch.
  B. The MAC address of 0000.00aa.aaaa will be added to the MAC Address Table.
  D. The frame will be forwarded out all active switch ports except for port fa0/0.

  ---

  If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from.

• Question 123:

  What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.)

  A. Allow unrestricted access to the console or VTY ports.
  B. Use a firewall to restrict access from the outside to the network devices.
  C. Always use Telnet to access the device command line because its data is automatically encrypted.
  D. Use SSH or another encrypted and authenticated transport to access device configurations.
  E. Prevent the loss of passwords by disabling password encryption.
  B. Use a firewall to restrict access from the outside to the network devices.
  D. Use SSH or another encrypted and authenticated transport to access device configurations.

• Question 124:

  Refer to the exhibit.

  

  Why did the device return this message?

  A. The command requires additional options or parameters
  B. There is no show command that starts with ru.
  C. The command is being executed from the wrong router mode.
  D. There is more than one show command that starts with the letters ru.
  D. There is more than one show command that starts with the letters ru.

  ---

  Answer D is correct because when you type the incomplete command having more same more command same up to types characters it shows display the ambiguous command error.

• Question 125:

  Which command is used to display the collection of OSPF link states?

  A. show ip ospf link-state
  B. show ip ospf lsa database
  C. show ip ospf neighbors
  D. show ip ospf database
  D. show ip ospf database

  ---

  The "show ip ospf database" command displays the link states. Here is an example:

  Here is the lsa database on R2.

  R2#show ip ospf database

  OSPF Router with ID (2.2.2.2) (Process ID 1)

  Router Link States (Area 0)

  Link ID ADV Router Age Seq# Checksum Link count

  2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 2

  10.4.4.4 10.4.4.4 776 0x80000004 0x005643 1

  111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2 133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum

  10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B

  10.2.2.3 133.133.133.133 812 0x80000001 0x004BA9

  10.4.4.1 111.111.111.111 755 0x80000001 0x007F16

  10.4.4.3 133.133.133.133 775 0x80000001 0x00C31F

• Question 126:

  What should be part of a comprehensive network security plan?

  A. Allow users to develop their own approach to network security.
  B. Physically secure network equipment from potential access by unauthorized individuals.
  C. Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgotten.
  D. Delay deployment of software patches and updates until their effect on end-user equipment is well known and widely reported.
  E. Minimize network overhead by deactivating automatic antivirus client updates.
  B. Physically secure network equipment from potential access by unauthorized individuals.

• Question 127:

  Which transport layer protocol provides best-effort delivery service with no acknowledgment receipt required?

  A. HTTP
  B. IP
  C. TCP
  D. Telnet
  E. UDP
  E. UDP

  ---

  UDP provides a connectionless datagram service that offers best-effort delivery, which means that UDP does not guarantee delivery or verify sequencing for any datagrams. A source host that needs reliable communication must use either TCP or a program that provides its own sequencing and acknowledgment services.

• Question 128:

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

  ---

  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 address--The 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 address--A 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 address--The 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 address-- The 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 address--A local address is any address that appears on the inside portion of the network. Global address--A global address is any address that appears on the outside portion of the network.

• Question 129:

  Which option is a valid IPv6 address?

  A. 2001:0000:130F::099a::12a
  B. 2002:7654:A1AD:61:81AF:CCC1
  C. FEC0:ABCD:WXYZ:0067::2A4
  D. 2004:1:25A4:886F::1
  D. 2004:1:25A4:886F::1

  ---

  http://www.ipv6.com/articles/general/IPv6-Addressing.htm

  IPv6 Address Notation IPv6 addresses are denoted by eight groups of hexadecimal quartets separated by colons in between them. Following is an example of a valid IPv6 address: 2001:cdba:0000:0000:0000:0000:3257:9652 Any four- digit group of zeroes within an IPv6 address may be reduced to a single zero or altogether omitted. Therefore, the following IPv6 addresses are similar and equally valid: 2001:cdba:0000:0000:0000:0000:3257:9652 2001:cdba:0:0:0:0:3257:9652 2001:cdba::3257:9652 The URL for the above address will be of the form: http://[2001:cdba:0000:0000:0000:0000:3257:9652]/

• Question 130:

  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.
  A. Speed is set to 100Mb/s.