Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 161:

  How does a DHCP server dynamically assign IP addresses to hosts?

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

  ---

  DHCP works in a client/server mode and operates like any other client/server relationship. When a PC connects to a DHCP server, the server assigns or leases an IP address to that PC. The PC connects to the network with that leased IP address until the lease expires. The host must contact the DHCP server periodically to extend the lease. This lease mechanism ensures that hosts that move or power off do not hold onto addresses that they do not need. The DHCP server returns these addresses to the address pool and reallocates them as necessary.

• Question 162:

  What command visualizes the general NetFlow data on the command line?

  A. show ip flow export
  B. show ip flow top-talkers
  C. show ip cache flow
  D. show mls sampling
  E. show mls netflow ip
  C. show ip cache flow

  ---

  The following is an example of how to visualize the NetFlow data using the CLI. There are three methods to visualize the data depending on the version of Cisco IOS Software. The traditional show command for NetFlow is "show ip cache flow" also available are two forms of top talker commands. One of the top talkers commands uses a static configuration to view top talkers in the network and another command called dynamic top talkers allows real-time sorting and aggregation of NetFlow data. Also shown is a show MLS command to view the hardware cache on the Cisco Catalyst 6500 Series Switch. The following is the original NetFlow show command used for many years in Cisco IOS Software. Information provided includes packet size distribution; basic statistics about number of flows and export timer setting, a view of the protocol distribution statistics and the NetFlow cache.

  The "show ip cache flow" command displays a summary of the NetFlow accounting statistics.

  

  Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/prod_white_paper0900aecd80406232.html

• Question 163:

  Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.)

  A. Router(config)# router ospf 0
  B. Router(config)# router ospf 1
  C. Router(config)# router ospf area 0
  D. Router(config-router)# network 192.168.16.0 0.0.0.255 0
  E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0
  F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0
  B. Router(config)# router ospf 1
  E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0

  ---

  In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -> but

  To configure OSPF, we need a wildcard in the "network" statement, not a subnet mask. We also need to assgin an area to this process ->.

• Question 164:

  Refer to the exhibit.

  

  The network shown in the diagram is experiencing connectivity problems. Which of the following will correct the problems? (Choose two.)

  A. Configure the gateway on Host A as 10.1.1.1.
  B. Configure the gateway on Host B as 10.1.2.254.
  C. Configure the IP address of Host A as 10.1.2.2.
  D. Configure the IP address of Host B as 10.1.2.2.
  E. Configure the masks on both hosts to be 255.255.255.224.
  F. Configure the masks on both hosts to be 255.255.255.240.
  B. Configure the gateway on Host B as 10.1.2.254.
  D. Configure the IP address of Host B as 10.1.2.2.

  ---

  The switch 1 is configured with two VLANs: VLAN1 and VLAN2. The IP information of member Host A in VLAN1 is as follows: Address : 10.1.1.126 Mask : 255.255.255.0 Gateway : 10.1.1.254 The IP information of member Host B in VLAN2 is as follows: Address : 10.1.1.12 Mask : 255.255.255.0 Gateway : 10.1.1.254 The configuration of sub-interface on router 2 is as follows: Fa0/0.1 -- 10.1.1.254/24 VLAN1 Fa0/0.2 -- 10.1.2.254/24 VLAN2 It is obvious that the configurations of the gateways of members in VLAN2 and the associated network segments are wrong. The layer3 addressing information of Host B should be modified as follows: Address : 10.1.2.X Mask : 255.255.255.0

• Question 165:

  Refer to the exhibit.

  

  The Lakeside Company has the internetwork in the exhibit. The administrator would like to reduce the size of the routing table on the Central router. Which partial routing table entry in the Central router represents a route summary that represents the LANs in Phoenix but no additional subnets?

  A. 10.0.0.0/22 is subnetted, 1 subnets D 10.0.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  B. 10.0.0.0/28 is subnetted, 1 subnets D 10.2.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  C. 10.0.0.0/30 is subnetted, 1 subnets D 10.2.2.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  D. 10.0.0.0/22 is subnetted, 1 subnets D 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  E. 10.0.0.0/28 is subnetted, 1 subnets D 10.4.4.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  F. 10.0.0.0/30 is subnetted, 1 subnets D 10.4.4.4 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1
  D. 10.0.0.0/22 is subnetted, 1 subnets D 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1

  ---

  The 10.4.0.0/22 route includes 10.4.0.0/24, 10.4.1.0/24, 10.4.2.0/24 and 10.4.3.0/24 networks only.

• Question 166:

  Which two options are valid WAN connectivity methods? (Choose two.)

  A. PPP
  B. WAP
  C. DSL
  D. L2TPv3
  E. Ethernet
  A. PPP
  C. DSL

  ---

  The Point-to-Point Protocol (PPP) provides a standard method for transporting multi-protocol datagrams over point-to-point links. PPP was originally emerged as an encapsulation protocol for transporting IP traffic between two peers. It is a

  data link layer protocol used for WAN connections.

  DSL is also considered a WAN connection, as it can be used to connect networks, typically when used with VPN technology.

• Question 167:

  The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?

  A. This command should be executed from the global configuration mode.
  B. The IP address 10.121.16.8 is the local router port used to forward data.
  C. 102 is the remote DLCI that will receive the information.
  D. This command is required for all Frame Relay configurations.
  E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.
  E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.

  ---

  Broadcast is added to the configurations of the frame relay, so the PVC supports broadcast, allowing the routing protocol updates that use the broadcast update mechanism to be forwarded across itself.

• Question 168:

  When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.)

  A. network or subnetwork IP address
  B. broadcast address on the network
  C. IP address leased to the LAN
  D. IP address used by the interfaces
  E. manually assigned address to the clients
  F. designated IP address to the DHCP server
  A. network or subnetwork IP address
  B. broadcast address on the network

  ---

  Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they can't be assignable.

• Question 169:

  Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choose two.)

  A. 802.1d
  B. VTP
  C. 802.1q
  D. STP E. SAP
  A. 802.1d
  D. STP E. SAP

  ---

  This question is to examine the STP protocol.

  STP (802.1d) is used to prevent Layer 2 loops.

  802.1q is a Frame Relay protocol which belongs to VLAN.

  SAP is a concept of the OSI model.

• Question 170:

  Which two are features of IPv6? (Choose two.)

  A. anycast
  B. broadcast
  C. multicast
  D. podcast
  E. allcast
  A. anycast
  C. multicast

  ---

  IPv6 addresses are classified by the primary addressing and routing methodologies common in networking: unicast addressing, anycast addressing, and multicast addressing. A unicast address identifies a single network interface. The Internet Protocol delivers packets sent to a unicast address to that specific interface.

  

  An anycast address is assigned to a group of interfaces, usually belonging to different nodes. A packet sent to an anycast address is delivered to just one of the member interfaces, typically the nearest host, according to the routing

  

  protocol's definition of distance. Anycast addresses cannot be identified easily, they have the same format as unicast addresses, and differ only by their presence in the network at multiple points. Almost any unicast address can be employed as an anycast address. A multicast address is also used by multiple hosts, which acquire the multicast address destination by participating in the multicast distribution protocol among the network routers. A packet that is sent to a multicast address is delivered to

  

  all interfaces that have joined the corresponding multicast group.