Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 281:

  Which characteristics are representatives of a link-state routing protocol? (Choose three.)

  A. provides common view of entire topology
  B. exchanges routing tables with neighbors
  C. calculates shortest path
  D. utilizes event-triggered updates
  E. utilizes frequent periodic updates
  A. provides common view of entire topology
  C. calculates shortest path
  D. utilizes event-triggered updates

  ---

  Each of routers running link-state routing protocol learns paths to all the destinations in its "area" so we can say although it is a bit unclear. Link-state routing protocols generate routing updates only (not the whole routing table) when a change

  occurs in the network topology so Link-state routing protocol like OSPF uses Dijkstra algorithm to calculate the shortest path ->.

  Unlike Distance vector routing protocol (which utilizes frequent periodic updates), link-state routing protocol utilizes event-triggered updates (only sends update when a change occurs) ->.

• Question 282:

  Which three statements about Syslog utilization are true? (Choose three.)

  A. Utilizing Syslog improves network performance.
  B. The Syslog server automatically notifies the network administrator of network problems.
  C. A Syslog server provides the storage space necessary to store log files without using router disk space.
  D. There are more Syslog messages available within Cisco IOS than there are comparable SNMP trap messages.
  E. Enabling Syslog on a router automatically enables NTP for accurate time stamping.
  F. A Syslog server helps in aggregation of logs and alerts.
  C. A Syslog server provides the storage space necessary to store log files without using router disk space.
  D. There are more Syslog messages available within Cisco IOS than there are comparable SNMP trap messages.
  F. A Syslog server helps in aggregation of logs and alerts.

  ---

  The Syslog sender sends a small (less than 1KB) text message to the Syslog receiver. The Syslog receiver is commonly called "syslogd," "Syslog daemon," or "Syslog server." Syslog messages can be sent via UDP (port 514) and/or TCP (typically, port 5000). While there are some exceptions, such as SSL wrappers, this data is typically sent in clear text over the network. A Syslog server provides the storage space necessary to store log files without using router disk space. In general, there are significantly more Syslog messages available within IOS as compared to SNMP Trap messages. For example, a Cisco Catalyst 6500 switch running Cisco IOS Software Release 12.2(18)SXF contains about 90 SNMP trap notification messages, but has more than 6000 Syslog event messages. System logging is a method of collecting messages from devices to a server running a syslog daemon. Logging to a central syslog server helps in aggregation of logs and alerts. Cisco devices can send their log messages to a UNIX-style syslog service. A syslog service accepts messages and stores them in files, or prints them according to a simple configuration file.

  Reference: http://www.cisco.com/c/en/us/products/collateral/services/high-availability/white_paper_c11-557812.html

• Question 283:

  Refer to the exhibit.

  

  The network administrator normally establishes a Telnet session with the switch from host A. However, host A is unavailable. The administrator's attempt to telnet to the switch from host B fails, but pings to the other two hosts are successful. What is the issue?

  A. Host B and the switch need to be in the same subnet.
  B. The switch interface connected to the router is down.
  C. Host B needs to be assigned an IP address in VLAN 1.
  D. The switch needs an appropriate default gateway assigned.
  E. The switch interfaces need the appropriate IP addresses assigned.
  D. The switch needs an appropriate default gateway assigned.

  ---

  Ping was successful form host B to other hosts because of intervlan routing configured on router. But to manage switch via telnet the VLAN32 on the switch needs to be configured interface vlan32 along with ip address and its appropriate

  default-gateway address.

  Since VLAN1 interface is already configure on switch Host A was able to telnet switch.

• Question 284:

  Refer to the exhibit.

  

  An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?

  A. data link layer
  B. application layer
  C. access layer
  D. session layer
  E. network layer
  E. network layer

  ---

  The command ping uses ICMP protocol, which is a network layer protocol used to propagate control message between host and router. The command ping is often used to verify the network connectivity, so it works at the network layer.

• Question 285:

  What is one benefit of PVST+?

  A. PVST+ supports Layer 3 load balancing without loops.
  B. PVST+ reduces the CPU cycles for all the switches in the network.
  C. PVST+ allows the root switch location to be optimized per VLAN.
  D. PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage.
  C. PVST+ allows the root switch location to be optimized per VLAN.

  ---

  The PVST+ provides Layer 2 load-balancing for the VLAN on which it runs. You can create different logical topologies by using the VLANs on your network to ensure that all of your links are used but that no one link is oversubscribed. Each instance of PVST+ on a VLAN has a single root switch. This root switch propagates the spanning-tree information associated with that VLAN to all other switches in the network. Because each switch has the same information about the network, this process ensures that the network topology is maintained and optimized per VLAN.

  Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se/configuration/guide/swstp.html

• Question 286:

  Which two statements describe characteristics of IPv6 unicast addressing? (Choose two.)

  A. Global addresses start with 2000::/3.
  B. Link-local addresses start with FE00:/12.
  C. Link-local addresses start with FF00::/10.
  D. There is only one loopback address and it is ::1.
  E. If a global address is assigned to an interface, then that is the only allowable address for the interface.
  A. Global addresses start with 2000::/3.
  D. There is only one loopback address and it is ::1.

  ---

  Below is the list of common kinds of IPv6 addresses:

  

• Question 287:

  Refer to the exhibit.

  

  Statements A, B, C, and D of ACL 10 have been entered in the shown order and applied to interface E0 inbound, to prevent all hosts (except those whose addresses are the first and last IP of subnet 172.21.1.128/28) from accessing the network. But as is, the ACL does not restrict anyone from the network. How can the ACL statements be re-arranged so that the system works as intended?

  A. ACDB
  B. BADC
  C. DBAC
  D. CDBA
  D. CDBA

  ---

  Routers go line by line through an access list until a match is found and then will not look any further, even if a more specific of better match is found later on in the access list. So, it it best to begin with the most specific entries first, in this cast the two hosts in line C and D. Then, include the subnet (B) and then finally the rest of the traffic (A).

• Question 288:

  What is a global command?

  A. a command that is set once and affects the entire router
  B. a command that is implemented in all foreign and domestic IOS versions
  C. a command that is universal in application and supports all protocols
  D. a command that is available in every release of IOS, regardless of the version or deployment status
  E. a command that can be entered in any configuration mode
  A. a command that is set once and affects the entire router

  ---

  When you enter global configuration mode and enter a command, it is applied to the running configuration file that is currently running in ram. The configuration of a global command affects the entire router. An example of a global command

  is one used for the hostname of the router.

  Incorrect Answers:

  A. Global configuration commands must be performed while in global configuration mode. For example, when you are in the interface configuration mode, you most likely will need to exit out into global mode to type in the commands.

  B. Global commands do not necessarily support every protocol.

  C. This is not necessarily true, since there are certain global commands that are supported on one feature set that are not on a different feature set of IOS.

  E. Global commands can become outdated, and can be replaced by newer commands in the newer releases of IOS.

• Question 289:

  An administrator is trying to ping and telnet from SwitchC to RouterC with the results shown below.

  

  Click the console connected to RouterC and issue the appropriate commands to answer the questions.

  

  

  Which will fix the issue and allow ONLY ping to work while keeping telnet disabled?

  A. Correctly assign an IP address to interface fa0/1.
  B. Change the ip access-group command on fa0/0 from "in" to "out".
  C. Remove access-group 106 in from interface fa0/0 and add access-group 115 in.
  D. Remove access-group 102 out from interface s0/0/0 and add access-group 114 in.
  E. Remove access-group 106 in from interface fa0/0 and add access-group 104 in.
  E. Remove access-group 106 in from interface fa0/0 and add access-group 104 in.

  ---

  Let's have a look at the access list 104:

  

  The question does not ask about ftp traffic so we don't care about the two first lines. The 3rd line denies all telnet traffic and the 4th line allows icmp traffic to be sent (ping). Remember that the access list 104 is applied on the inbound direction so the 5th line "access-list 104 deny icmp any any echo-reply" will not affect our icmp traffic because the "echo-reply" message will be sent over the outbound direction.

• Question 290:

  DRAG DROP

  Drag the cable type on the left to the purpose for which it is best suited on the right. (Not all options are used.)

  Select and Place:

  

  

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  To remember which type of cable you should use, follow these tips:

  -To connect two serial interfaces of 2 routers we use serial cable

  – To specify when we use crossover cable or straight-through cable, we should remember: Group 1: Router, Host, Server Group 2: Hub, Switch One device in group 1 + One device in group 2: use straight-through cableTwo devices in the same group: use crossover cable For example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub to server… and we use crossover cable to connect switch to switch, switch to hub, router to router, host to host…)