Cisco 100-101 Online Practice Questions and Exam Preparation

Cisco 100-101 Online Questions & Answers

• Question 1:

  To what type of port would a cable with a DB-60 connector attach?

  A. Serial port
  B. Console port
  C. Ethernet port
  D. Fibre optic port
  A. Serial port

• Question 2:

  Which command enables IPv6 forwarding on a Cisco router?

  A. ipv6 host
  B. ipv6 unicast-routing
  C. ipv6 local
  D. ipv6 neighbor
  B. ipv6 unicast-routing

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  Enabling IPv6 on Cisco IOS Software Technology http://www.ciscopress.com/articles/article.asp?p=31948andseqNum=4 Explanation: The first step of enabling IPv6 on a Cisco router is the activation of IPv6 traffic forwarding to forward unicast IPv6 packets between network interfaces. By default, IPv6 traffic forwarding is disabled on Cisco routers. The ipv6 unicast-routing command is used to enable the forwarding of IPv6 packets between interfaces on the router. The syntax for this command is as follows: Router(config)#ipv6 unicast-routing The ipv6 unicast-routing command is enabled on a global basis.

• Question 3:

  Which statements are TRUE regarding Internet Protocol version 6 (IPv6) addresses? (Choose three.)

  A. An IPv6 address is divided into eight 16-bit groups.
  B. A double colon (::) can only be used once in a single IPv6 address.
  C. IPv6 addresses are 196 bits in length.
  D. Leading zeros cannot be omitted in an IPv6 address.
  E. Groups with a value of 0 can be represented with a single 0 in IPv6 address.
  A. An IPv6 address is divided into eight 16-bit groups.
  B. A double colon (::) can only be used once in a single IPv6 address.
  E. Groups with a value of 0 can be represented with a single 0 in IPv6 address.

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  IPv6 addresses are divided into eight 16-bit groups, a double colon (::) can only be used once in an IPv6 address, and groups with a value of 0 can be represented with a single 0 in an IPv6 address. The following statements are also true

  regarding IPv6 address:

  IPv6 addresses are 128 bits in length.

  Eight 16-bit groups are divided by a colon (:).

  Multiple groups of 16-bit 0s can be represented with double colon (::).

  Double colons (::) represent only 0s.

  Leading zeros can be omitted in an IPv6 address.

  The option stating that IPv6 addresses are 196 bits in length is incorrect. IPv6 addresses are 128 bits in length.

  The option stating that leading zeros cannot be omitted in an IPv6 address is incorrect. Leading zeros can be omitted in an IPv6 address.

• Question 4:

  Given a Class C IP address subnetted with a /30 subnet mask, how many valid host IP addresses are available on each of the subnets?

  A. 1
  B. 2
  C. 4
  D. 8
  E. 252
  F. 254
  B. 2

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  /30 CIDR corresponds to mask 55.255.255.252 whose binary is 11111100 which means 6 subnet bits and 2 host bits which means 62 subnets and 2 hosts per subnet.

• Question 5:

  Which layer of the TCP/IP stack combines the OSI model physical and data link layers?

  A. Internet layer
  B. transport layer
  C. application layer
  D. network access layer
  D. network access layer

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  The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication over the internet. The TCP/ IP model was created after the OSI 7 layer model for two major reasons. First, the foundation of the Internet was built using the TCP/IP suite and through the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the Department of Defense (DOD) consisted of creating the TCP/IP protocols. The DOD's goal was to bring international standards which could not be met by the OSI model. Since the DOD was the largest software consumer and they preferred the TCP/IP suite, most vendors used this model rather then the OSI. Below is a side by side comparison of the TCP/IP and OSI models.

  

• Question 6:

  The network manager has requested a 300-workstation expansion of the network. The workstations are to be installed in a single broadcast domain, but each workstation must have its own collision domain. The expansion is to be as cost-effective as possible while still meeting the requirements.

  Which three items will adequately fulfill the request? (Choose three).

  A. One IP subnet with a mask of 255.255.254.0
  B. Two IP subnets with a mask of 255.255.255.0
  C. Seven 48-port hubs
  D. Seven 48-port switches
  E. One router interface
  F. Seven router interfaces
  A. One IP subnet with a mask of 255.255.254.0
  D. Seven 48-port switches
  E. One router interface

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  of 255.255.254.0 can absorb 510 hosts being 23 bits mask and also 7*48 port switches can handle this much hosts and router interface is required to be minimum to avoid unnecessary wastage hence the answers.

• Question 7:

  Refer to the exhibit.

  

  A problem with network connectivity has been observed. It is suspected that the cable connected to switch port Fa0/9 on Switch1 is disconnected. What would be an effect of this cable being disconnected?

  A. Host B would not be able to access the server in VLAN9 until the cable is reconnected.
  B. Communication between VLAN3 and the other VLANs would be disabled.
  C. The transfer of files from Host B to the server in VLAN9 would be significantly slower.
  D. For less than a minute, Host B would not be able to access the server in VLAN9. Then normal network function would resume.
  D. For less than a minute, Host B would not be able to access the server in VLAN9. Then normal network function would resume.

• Question 8:

  A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server?

  A. HTTP
  B. DNS
  C. DHCP
  D. RARP
  E. ARP
  E. ARP

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  The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server

• Question 9:

  The ip helper-address command does what?

  A. assigns an IP address to a host
  B. resolves an IP address from a DNS server
  C. relays a DHCP request across networks
  D. resolves an IP address overlapping issue
  C. relays a DHCP request across networks

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  http://cisconet.com/tcpip/dhcp/107-how-to-use-ip-helper-address-to-connect-remote-dhcp- server.html

  When the DHCP client sends the DHCP request packet, it doesn't have an IP address. So it uses the all- zeroes address, 0.0.0.0, as the IP source address. And it doesn't know how to reach the DHCP server, so it uses a general broadcast address, 255.255.255.255, for the destination. So the router must replace the source address with its own IP address, for the interface that received the request. And it replaces the destination address with the address specified in the ip helper-address command. The client device's MAC address is included in the payload of the original DHCP request packet, so the router doesn't need to do anything to ensure that the server receives this information.

• Question 10:

  Which statements are true regarding ICMP packets? (Choose two.)

  A. They acknowledge receipt of TCP segments.
  B. They guarantee datagram delivery.
  C. TRACERT uses ICMP packets.
  D. They are encapsulated within IP datagrams.
  E. They are encapsulated within UDP datagrams.
  C. TRACERT uses ICMP packets.
  D. They are encapsulated within IP datagrams.

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  Ping may be used to find out whether the local machines are connected to the network or whether a remote site is reachable. This tool is a common network tool for determining the network connectivity which uses ICMP protocol instead of TCP/IP and UDP/IP. This protocol is usually associated with the network management tools which provide network information to network administrators, such as ping and traceroute (the later also uses the UDP/IP protocol). ICMP is quite different from the TCP/IP and UDP/IP protocols. No source and destination ports are included in its packets. Therefore, usual packet-filtering rules for TCP/IP and UDP/IP are not applicable. Fortunately, a special "signature" known as the packet's Message type is included for denoting the purposes of the ICMP packet. Most commonly used message types are namely, 0, 3, 4, 5, 8, 11, and 12 which represent echo reply, destination unreachable, source quench, redirect, echo request, time exceeded, and parameter problem respectively. In the ping service, after receiving the ICMP "echo request" packet from the source location, the destination