Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 241:

  Which two statements about the OSPF Router ID are true? (Choose two.)

  A. It identifies the source of a Type 1 LSA.
  B. It should be the same on all routers in an OSPF routing instance.
  C. By default, the lowest IP address on the router becomes the OSPF Router ID.
  D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.
  E. It is created using the MAC Address of the loopback interface.
  A. It identifies the source of a Type 1 LSA.
  D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.

  ---

  r120#show ip ospf data

  OSPF Router with ID (10.0.0.120) (Process ID 1)

  Next, who are the other routers in our area?

  Router Link States (Area 1)

  Link ID ADV Router Age Seq# Checksum Link count

  10.0.0.111 10.0.0.111 600 0x8000023A 0x0092B3 1

  10.0.0.112 10.0.0.112 1246 0x80000234 0x009CAC 1

  10.0.0.113 10.0.0.113 148 0x8000022C 0x004399 3

  10.0.0.120 10.0.0.120 152 0x80000240 0x0046CB 1

  We can see OSPF Router ID will be used as source of Type 1 LSA. Also the router will chose the highest loopback interface as its OSPF router ID (if available).

• Question 242:

  Refer to the exhibit.

  

  At the end of an RSTP election process, which access layer switch port will assume the discarding role?

  A. Switch3, port fa0/1
  B. Switch3, port fa0/12
  C. Switch4, port fa0/11
  D. Switch4, port fa0/2
  E. Switch3, port Gi0/1
  F. Switch3, port Gi0/2
  C. Switch4, port fa0/11

  ---

  In this question, we only care about the Access Layer switches (Switch3 and 4). Switch 3 has a lower bridge ID than Switch 4 (because the MAC of Switch3 is smaller than that of Switch4) so both ports of Switch3 will be in forwarding state. The

  alternative port will surely belong to Switch4.

  Switch4 will need to block one of its ports to avoid a bridging loop between the two switches. But how does Switch4 select its blocked port? Well, the answer is based on the BPDUs it receives from Switch3. A BPDU is superior to another if it

  has:

  1.

  A lower Root Bridge ID

  2.

  A lower path cost to the Root

  3.

  A lower Sending Bridge ID

  4.

  A lower Sending Port ID

  These four parameters are examined in order. In this specific case, all the BPDUs sent by Switch3 have the same Root Bridge ID, the same path cost to the Root and the same Sending Bridge ID. The only parameter left to select the best one is the Sending Port ID (Port ID = port priority + port index). In this case the port priorities are equal because they use the default value, so Switch4 will compare port index values, which are unique to each port on the switch, and because Fa0/12 is inferior to Fa0/1, Switch4 will select the port connected with Fa0/1 (of Switch3) as its root port and block the other port -> Port fa0/11 of Switch4 will be blocked (discarding role).

• Question 243:

  Which statement about access lists that are applied to an interface is true?

  A. You can place as many access lists as you want on any interface.
  B. You can apply only one access list on any interface.
  C. You can configure one access list, per direction, per Layer 3 protocol.
  D. You can apply multiple access lists with the same protocol or in different directions.
  C. You can configure one access list, per direction, per Layer 3 protocol.

  ---

  We can have only 1 access list per protocol, per direction and per interface. It means:

  +

  We cannot have 2 inbound access lists on an interface

  +

  We can have 1 inbound and 1 outbound access list on an interface

• Question 244:

  What does a Layer 2 switch use to decide where to forward a received frame?

  A. source MAC address
  B. source IP address
  C. source switch port
  D. destination IP address
  E. destination port address
  F. destination MAC address
  F. destination MAC address

  ---

  When a frame is received, the switch looks at the destination hardware address and finds the interface if it is in its MAC address table. If the address is unknown, the frame is broadcast on all interfaces except the one it was received on.

• Question 245:

  Refer to the exhibit.

  

  Given this output for SwitchC, what should the network administrator's next action be?

  A. Check the trunk encapsulation mode for SwitchC's fa0/1 port.
  B. Check the duplex mode for SwitchC's fa0/1 port.
  C. Check the duplex mode for SwitchA's fa0/2 port.
  D. Check the trunk encapsulation mode for SwitchA's fa0/2 port.
  C. Check the duplex mode for SwitchA's fa0/2 port.

  ---

  Here we can see that this port is configured for full duplex, so the next step would be to check the duplex setting of the port on the other switch. A mismatched trunk encapsulation would not result in input errors and CRC errors.

• Question 246:

  Refer to the exhibit.

  

  The network administrator requires easy configuration options and minimal routing protocol traffic. What two options provide adequate routing table information for traffic that passes between the two routers and satisfy the requests of the network administrator? (Choose two.)

  A. a dynamic routing protocol on InternetRouter to advertise all routes to CentralRouter.
  B. a dynamic routing protocol on InternetRouter to advertise summarized routes to CentralRouter.
  C. a static route on InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralRouter.
  D. a dynamic routing protocol on CentralRouter to advertise all routes to InternetRouter.
  E. a dynamic routing protocol on CentralRouter to advertise summarized routes to InternetRouter.
  F. a static, default route on CentralRouter that directs traffic to InternetRouter.
  C. a static route on InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralRouter.
  F. a static, default route on CentralRouter that directs traffic to InternetRouter.

  ---

  The use of static routes will provide the necessary information for connectivity while producing no routing traffic overhead.

• Question 247:

  Which three statements about static routing are true? (Choose three.)

  A. It uses consistent route determination.
  B. It is best used for small-scale deployments.
  C. Routing is disrupted when links fail.
  D. It requires more resources than other routing methods.
  E. It is best used for large-scale deployments.
  F. Routers can use update messages to reroute when links fail.
  A. It uses consistent route determination.
  B. It is best used for small-scale deployments.
  C. Routing is disrupted when links fail.

• Question 248:

  Refer to the exhibit.

  

  A network associate has configured OSPF with the command:

  City(config-router)# network 192.168.12.64 0.0.0.63 area 0

  After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.)

  A. FastEthernet0 /0
  B. FastEthernet0 /1
  C. Serial0/0
  D. Serial0/1.102
  E. Serial0/1.103
  F. Serial0/1.104
  B. FastEthernet0 /1
  C. Serial0/0
  D. Serial0/1.102

  ---

  The "network 192.168.12.64 0.0.0.63 equals to network 192.168.12.64/26. This network has:

  +

  Increment: 64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000)

  +

  Network address: 192.168.12.64

  +

  Broadcast address: 192.168.12.127

  Therefore all interfaces in the range of this network will join OSPF.

• Question 249:

  Refer to the exhibit.

  

  How should the FastEthernet0/1 ports on the switches that are shown in the exhibit be configured to allow connectivity between all devices?

  A. The ports only need to be connected by a crossover cable.
  B. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode trunk
  C. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode access SwitchX(config-if)# switchport access vlan 1
  D. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode trunk SwitchX(config-if)# switchport trunk vlan 1 SwitchX(config-if)# switchport trunk vlan 10 SwitchX(config-if)# switchport trunk vlan 20
  B. SwitchX(config)# interface fastethernet 0/1 SwitchX(config-if)# switchport mode trunk

  ---

  IN order for multiple VLANs to cross switches, the connection between the switches must be a trunk. The "switchport mode trunk" command is all that is needed, the individual VLANs should not be listed over that trunk interface.

• Question 250:

  Scenario

  Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.

  The EIGRP routing protocol is configured.

  You are required to troubleshoot and resolve the EIGRP issues between the various routers.

  Use the appropriate show commands to troubleshoot the issues.

  

  

  

  Which path does traffic take from R1 to R5?

  A. The traffic goes through R2.
  B. The traffic goes through R3.
  C. The traffic is equally load-balanced over R2 and R3.
  D. The traffic is unequally load-balanced over R2 and R3.
  A. The traffic goes through R2.

  ---

  Using the "show ip int brief command" on R5 we can see the IP addresses assigned to this router. Then, using the "show ip route" command on R1 we can see that to reach 10.5.5.5 and 10.5.5.55 the preferred path is via Serial 1/3, which we see from the diagram is the link to R2.