Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 61:

  Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

  A. transport
  B. network
  C. presentation
  D. session
  E. application
  E. application

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  This question is to examine the OSI reference model.

  The Application layer is responsible for identifying and establishing the availability of the intended communication partner and determining whether sufficient resources for the intended communication exist.

• Question 62:

  What is known as "one-to-nearest" addressing in IPv6?

  A. global unicast
  B. anycast
  C. multicast
  D. unspecified address
  B. anycast

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  IPv6 Anycast addresses are used for one-to-nearest communication, meaning an Anycast address is used by a device to send data to one specific recipient (interface) that is the closest out of a group of recipients (interfaces).

• Question 63:

  The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two.)

  A. no broadcast
  B. change of source address in the IPv6 header
  C. change of destination address in the IPv6 header
  D. Telnet access does not require a password
  E. autoconfiguration
  F. NAT
  A. no broadcast
  E. autoconfiguration

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  IPv6 does not use broadcasts, and autoconfiguration is a feature of IPV6 that allows for hosts to automatically obtain an IPv6 address.

• Question 64:

  Which command would you use on a Cisco router to verify the Layer 3 path to a host?

  A. tracert address
  B. traceroute address
  C. telnet address
  D. ssh address
  B. traceroute address

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  In computing, traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop indicates the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated. Ping, on the other hand, only computes the final round-trip times from the destination point.

• Question 65:

  What SNMP message alerts the manager to a condition on the network?

  A. response
  B. get
  C. trap
  D. capture
  C. trap

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  An agent can send unsolicited traps to the manager. Traps are messages alerting the SNMP manager to a condition on the network. Traps can mean improper user authentication, restarts, link status (up or down), MAC address tracking, closing of a TCP connection, loss of connection to a neighbor, or other significant events.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_9_ea1/configuration/guide/scg/swsnmp.html

• Question 66:

  Which of the following are benefits of VLANs? (Choose three.)

  A. They increase the size of collision domains.
  B. They allow logical grouping of users by function.
  C. They can enhance network security.
  D. They increase the size of broadcast domains while decreasing the number of collision domains.
  E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.
  F. They simplify switch administration.
  B. They allow logical grouping of users by function.
  C. They can enhance network security.
  E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

  ---

  When using VLAN the number and size of collision domains remain the same ->.

  VLANs allow to group users by function, not by location or geography ->.

  VLANs help minimize the incorrect configuration of VLANs so it enhances the security of the network ->.

  VLAN increases the size of broadcast domains but does not decrease the number of collision domains ->.

  VLANs increase the number of broadcast domains while decreasing the size of the broadcast domains which increase the utilization of the links. It is also a big advantage of VLAN ->.

  VLANs are useful but they are more complex and need more administration ->.

• Question 67:

  How does using the service password-encryption command on a router provide additional security?

  A. by encrypting all passwords passing through the router
  B. by encrypting passwords in the plain text configuration file
  C. by requiring entry of encrypted passwords for access to the device
  D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
  E. by automatically suggesting encrypted passwords for use in configuring the router
  B. by encrypting passwords in the plain text configuration file

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  By using this command, all the (current and future) passwords are encrypted. This command is primarily useful for keeping unauthorized individuals from viewing your password in your configuration file

• Question 68:

  A switch is configured with all ports assigned to VLAN 2 with full duplex FastEthernet to segment existing departmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?

  A. More collision domains will be created.
  B. IP address utilization will be more efficient.
  C. More bandwidth will be required than was needed previously.
  D. An additional broadcast domain will be created.
  D. An additional broadcast domain will be created.

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  Each VLAN creates its own broadcast domain. Since this is a full duplex switch, each port is a separate collision domain.

• Question 69:

  Refer to the exhibit.

  

  C-router is to be used as a "router-on-a-stick" to route between the VLANs. All the interfaces have been properly configured and IP routing is operational. The hosts in the VLANs have been configured with the appropriate default gateway. What is true about this configuration?

  A. These commands need to be added to the configuration: C-router(config)# router eigrp 123 C-router(config-router)# network 172.19.0.0
  B. These commands need to be added to the configuration: C-router(config)# router ospf 1 C-router(config-router)# network 172.19.0.0 0.0.3.255 area 0
  C. These commands need to be added to the configuration: C-router(config)# router rip C-router(config-router)# network 172.19.0.0
  D. No further routing configuration is required.
  D. No further routing configuration is required.

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  Since all the same router (C-router) is the default gateway for all three VLANs, all traffic destined to a different VLA will be sent to the C-router. The C-router will have knowledge of all three networks since they will appear as directly connected in the routing table. Since the C-router already knows how to get to all three networks, no routing protocols need to be configured.

• Question 70:

  Which statement describes the process of dynamically assigning IP addresses by the DHCP server?

  A. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.
  B. Addresses are permanently assigned so that the hosts uses the same address at all times.
  C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.
  D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.
  D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.

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  The DHCP lifecycle consists of the following:

  Allocation: A client begins with no active lease, and hence, no DHCP-assigned address. It acquires a lease through a process of allocation.

  

  Reallocation: If a client already has an address from an existing lease, then when it reboots or starts up after being shut down, it will contact the DHCP server that granted it the lease to confirm the lease and acquire operating parameters.

  

  This is sometimes called reallocation; it is similar to the full allocation process but shorter.

  Normal Operation: Once a lease is active, the client functions normally, using its assigned IP address and other parameters during the "main part" of the lease. The client is said to be bound to the lease and the address.

  

  Renewal: After a certain portion of the lease time has expired, the client will attempt to contact the server that initially granted the lease, to renew the lease so it can keep using its IP address.

  

  Rebinding. If renewal with the original leasing server fails (because, for example, the server has been taken offline), then the client will try to rebind to any active DHCP server, trying to extend its current lease with any server that will allow

  

  it to do so.

  Release: The client may decide at any time that it no longer wishes to use the IP address it was assigned, and may terminate the lease, releasing the IP address.