Cisco 642-813 Online Practice Questions and Exam Preparation

Cisco 642-813 Online Questions & Answers

• Question 51:

  A Cisco Catalyst switch that is prone to reboots continues to rebuild the DHCP snooping database. What is the solution to avoid the snooping database from being rebuilt after every device reboot?

  A. A DHCP snooping database agent should be configured.
  B. Enable DHCP snooping for all VLANs that are associated with the switch.
  C. Disable Option 82 for DHCP data insertion.
  D. Use IP Source Guard to protect the DHCP binding table entries from being lost upon rebooting.
  E. Apply ip dhcp snooping trust on all interfaces with dynamic addresses.
  A. A DHCP snooping database agent should be configured.

• Question 52:

  Refer to the exhibit.

  

  A network engineer investigates a recent network failure and notices that one of the interfaces on the switch is still down. What is causing the line protocol on this interface to be shown as down?

  A. There is a layer 1 physical issue.
  B. There is a speed mismatch on the interface.
  C. The interface is configured as the target of the SPAN session.
  D. The interface is configured as the source of the SPAN session.
  E. There is a duplex mismatch on the interface.
  C. The interface is configured as the target of the SPAN session.

• Question 53:

  You have been tasked with configuring multilayer SwitchC, which has a partial configuration and has been attached to RouterC as shown in the topology diagram.

  You need to configure SwitchC so that Hosts H1 and H2 can successfully ping the server S1. Also SwitchC needs to be able to ping server S1.

  Due to administrative restrictions and requirements you should not add/delete vlans or create trunk links. Company policies forbid the use of static or default routing. All routes must be learned via EIGRP 65010 routing protocol.

  You do not have access to RouteC. RouterC is correctly configured. No trunking has been configured on RouterC.

  Routed interfaces should use the lowest host on a subnet when possible. The following subnets are available to implement this solution:

  –

  10.10.10.0/24

  –

  190.200.250.32/27

  –

  190.200.250.64/27

  Hosts H1 and H2 are configured with the correct IP address and default gateway.

  SwitchC uses Cisco as the enable password.

  Routing must only be enabled for the specific subnets shown in the diagram.

  Note: Due to administrative restrictions and requirements you should not add or delete VLANs, changes VLAN port assignments or create trunks. Company policies forbid the use of static or default routing. All routes must be learned via the

  EIGRP routing protocol.

  

  

  Check the answer below

  There are two ways to configure interVLAN routing in this case:

  +

  Use RouterC as a “router on a stick” and SwitchC as a pure Layer2 switch. Trunking must be established between RouterC and SwitchC.

  +

  Only use SwitchC for interVLAN routing without using RouterC, SwitchC should be configured as a Layer 3 switch (which supports ip routing function as a router). No trunking requires.

  The question clearly states “No trunking has been configured on RouterC” so RouterC does not contribute to interVLAN routing of hosts H1 and H2 -> SwitchC must be configured as a Layer 3 switch with SVIs for interVLAN routing.

  We should check the default gateways on H1 and H2. Click on H1 and H2 and type the “ipconfig” command to get their default gateways.

  Answer: \>ipconfig

  We will get the default gateways as follows:

  Host1:

  +

  Default gateway: 190.200.250.33

  Host2:

  +

  Default gateway: 190.200.250.65

  Now we have enough information to configure SwitchC (notice the EIGRP AS in this case is 650)

  Note: VLAN2 and VLAN3 were created and gi0/10, gi0/11 interfaces were configured as access ports so we don't need to configure them in this sim.

  SwitchC# configure terminal

  SwitchC(config)# int gi0/1

  SwitchC(config-if)#no switchport -> without using this command, the simulator does not

  let you assign IP address on Gi0/1 interface.

  SwitchC(config-if)# ip address 10.10.10.2 255.255.255.0 ->RouterC has used IP 10.10.10.1 so this is the lowest usable IP address.

  SwitchC(config-if)# no shutdown

  SwitchC(config-if)# exit

  SwitchC(config)# int vlan 2

  SwitchC(config-if)# ip address 190.200.250.33 255.255.255.224

  SwitchC(config-if)# no shutdown

  SwitchC(config-if)# int vlan 3

  SwitchC(config-if)# ip address 190.200.250.65 255.255.255.224

  SwitchC(config-if)# no shutdown

  SwitchC(config-if)#exit

  SwitchC(config)# ip routing (Notice: MLS will not work without this command)

  SwitchC(config)# router eigrp 65010

  SwitchC(config-router)# network 10.10.10.0 0.0.0.255

  SwitchC(config-router)# network 190.200.250.32 0.0.0.31

  SwitchC(config-router)# network 190.200.250.64 0.0.0.31

  NOTE: THE ROUTER IS CORRECTLY CONFIGURED, so you will not miss within it in the exam, also don't modify/delete any port just do the above configuration. Also some reports said the “no auto-summary” command can't be used in the

  simulator, in fact it is not necessary because the network 190.200.0.0/16 is not used anywhere else in this topology.

  In order to complete the lab, you should expect the ping to SERVER to succeed from the MLS, and from the PCs as well.

  Also make sure you use the correct EIGRP AS number (in the configuration above it is 650 but it will change when you take the exam) but we are not allowed to access RouterC so the only way to find out the EIGRP AS is to look at the exhibit

  above. If you use wrong AS number, no neighbor relationship is formed between RouterC and SwitchC.

  In fact, we are pretty sure instead of using two commands “network 190.200.250.32 0.0.0.31 and “network 190.200.250.64 0.0.0.31 we can use one simple command “network 190.200.0.0 because it is the nature of distance vector routing

  protocol like EIGRP: only major networks need to be advertised; even without “no auto-summary” command the network still works correctly. But in the exam the sim is just a flash based simulator so we should use two above commands, just

  for sure. But after finishing the configuration, we can use “show run” command to verify, only the summarized network 190.200.0.0 is shown.

• Question 54:

  Which feature describes MAC addresses that are dynamically learned or manually configured, stored in the address table, and added to the running configuration?

  A. sticky
  B. dynamic
  C. static
  D. secure
  A. sticky

• Question 55:

  Which feature is automatically enabled when a voice VLAN is configured, but not automatically disabled when a voice VLAN is removed?

  A. portfast
  B. port-security
  C. spanning tree
  D. storm control
  A. portfast

• Question 56:

  While working in the core network building, a technician accidently bumps the fiber connection between two core switches and damages one of the pairs of fiber. As designed, the link was placed into a non-forwarding state due to a fault with UDLD. After the damaged cable was replaced, the link did not recover. What solution allows the network switch to automatically recover from such an issue?

  A. macros
  B. errdisable autorecovery
  C. IP Event Dampening
  D. command aliases
  E. Bidirectional Forwarding Detection
  B. errdisable autorecovery

• Question 57:

  Refer to the exhibit.

  

  An engineer is configuring EtherChannel between two switches and notices the console message on switch 2. Based on the output, which option describes the reason for this error?

  A. Switch 1 does not have enough member ports configured.
  B. Switch 2 has too many member ports configured.
  C. The port channel interface numbers do not match.
  D. The EtherChannel protocols do not match.
  D. The EtherChannel protocols do not match.

• Question 58:

  Which private VLAN access port belongs to the primary VLAN and can communicate with all interfaces, including the community and isolated host ports?

  A. promiscuous port
  B. isolated port
  C. community port
  D. trunk port
  A. promiscuous port

• Question 59:

  In which portion of the frame is the 802.1q header found?

  A. within the Ethernet header
  B. within the Ethernet payload
  C. within the Ethernet FCS
  D. within the Ethernet source MAC address
  A. within the Ethernet header

• Question 60:

  Which statement about the use of PAgP link aggregation on a Cisco switch that is running Cisco IOS Software is true?

  A. PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the formation of a channel.
  B. PAgP modes are active, desirable, and on. Only the combinations active-desirable, desirable-desirable, and on-on allow the formation of a channel.
  C. PAgP modes are active, desirable, and on. Only the combinations active-active, desirable-desirable, and on-on allow the formation of a channel.
  D. PAgP modes are off, active, desirable, and on. Only the combinations auto-auto, desirable-desirable, and on-on allow the formation of a channel.
  A. PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the formation of a channel.