Cisco 640-802 Online Practice Questions and Exam Preparation

Cisco 640-802 Online Questions & Answers

• Question 21:

  A network administrator is configuring ACLs on a Cisco router, to allow traffic from hosts on networks 192.168.146.0, 192.168.147.0, 192.168.148.0, and 192.168.149.0 only. Which two ACL statements, when combined, would you use to accomplish this task? (Choose two.)

  A. access-list 10 permit ip 192.168.146.0 0.0.1.255
  B. access-list 10 permit ip 192.168.147.0 0.0.255.255
  C. access-list 10 permit ip 192.168.148.0 0.0.1.255
  D. access-list 10 permit ip 192.168.149.0 0.0.255.255
  E. access-list 10 permit ip 192.168.146.0 0.0.0.255
  F. access-list 10 permit ip 192.168.146.0 255.255.255.0
  A. access-list 10 permit ip 192.168.146.0 0.0.1.255
  C. access-list 10 permit ip 192.168.148.0 0.0.1.255

  ---

  "access-list 10 permit ip 192.168.146.0 0.0.1.255" would allow only the 192.168.146.0 and 192.168.147.0 networks, and "access-list 10 permit ip 192.168.148.0 0.0.1.255" would allow only the 192.168.148.0 and 192.168.149.0 networks.

• Question 22:

  Which two statements about the tunnel mode ipv6ip command are true? (Choose two.)

  A. It enables the transmission of IPv6 packets within the configured tunnel.
  B. It specifies IPv4 as the encapsulation protocol.
  C. It specifies IPv6 as the encapsulation protocol.
  D. It specifies IPv6 as the transport protocol.
  E. It specifies that the tunnel is a Teredo tunnel.
  A. It enables the transmission of IPv6 packets within the configured tunnel.
  B. It specifies IPv4 as the encapsulation protocol.

• Question 23:

  Three switches are connected to one another via trunk ports. Assuming the default switch configuration, which switch is elected as the root bridge for the spanning-tree instance of VLAN 1?

  A. the switch with the highest MAC address
  B. the switch with the lowest MAC address
  C. the switch with the highest IP address
  D. the switch with the lowest IP address
  B. the switch with the lowest MAC address

  ---

  Each switch in your network will have a Bridge ID Priority value, more commonly referred to as a BID. This BID is a combination of a default priority value and the switch's MAC address, with the priority value listed first. The lowest BID will win the election process.

  For example, if a Cisco switch has the default priority value of 32,768 and a MAC address of 11-22-33-44-55-66, the BID would be 32768:11-22-33-44-55-66. Therefore, if the switch priority is left at the default, the MAC address is the deciding factor in the root bridge election.

• Question 24:

  Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

  A. Router(config-if)# ppp authentication chap fallback ppp
  B. Router(config-if)# ppp authentication chap pap
  C. Router(config-if)# authentication ppp chap fallback ppp
  D. Router(config-if)# authentication ppp chap pap
  B. Router(config-if)# ppp authentication chap pap

  ---

  This command tells the router first to use CHAP and then go to PAP if CHAP isn't available.

• Question 25:

  Why will a switch never learn a broadcast address?

  A. Broadcasts only use network layer addressing.
  B. A broadcast frame is never forwarded by a switch.
  C. A broadcast address will never be the source address of a frame.
  D. Broadcast addresses use an incorrect format for the switching table.
  E. Broadcast frames are never sent to switches.
  C. A broadcast address will never be the source address of a frame.

  ---

  Switches dynamically learn MAC addresses based on the source MAC addresses that it sees, and since a broadcast is never the source, it will never learn the broadcast address.

• Question 26:

  DRAG DROP

  Drag the Frame Relay acronym on the left to match its definition on the right. (Not all acronyms are used.)

  Select and Place:

  

  

• Question 27:

  Which set of commands is recommended to prevent the use of a hub in the access layer?

  A. switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security maximum 1
  B. switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security mac-address 1
  C. switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1
  D. switch(config-if)#switchport mode access switch(config-if)#switchport port-security mac-address 1
  C. switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1

  ---

  This question is to examine the layer 2 security configuration.

  In order to satisfy the requirements of this question, you should perform the following configurations in the interface mode:

  First, configure the interface mode as the access mode

  Second, enable the port security and set the maximum number of connections to 1.

• Question 28:

  Which command can you execute to set the user inactivity timer to 10 seconds?

  A. SW1(config-line)#exec-timeout 0 10
  B. SW1(config-line)#exec-timeout 10
  C. SW1(config-line)#absolute-timeout 0 10
  D. SW1(config-line)#absolute-timeout 10
  A. SW1(config-line)#exec-timeout 0 10

• Question 29:

  Refer to the exhibit.

  

  Which address range efficiently summarizes the routing table of the addresses for router Main?

  A. 172.16.0.0./21
  B. 172.16.0.0./20
  C. 172.16.0.0./16
  D. 172.16.0.0/18
  B. 172.16.0.0./20

  ---

  The 172.16.0.0./20 network is the best option as it includes all networks from 172.16.0.0 ?172.16.16.0 and does it more efficiently than the /16 and /18 subnets. The /21 subnet will not include all the other subnets in this one single summarized address.

• Question 30:

  What are the three things that the Netflow uses to consider the traffic to be in a same flow? (Choose three)

  A. IP address
  B. Interface name
  C. Port numbers
  D. L3 protocol type
  E. MAC address
  A. IP address
  C. Port numbers
  D. L3 protocol type

  ---

  What is an IP Flow?

  Each packet that is forwarded within a router or switch is examined for a set of IP packet attributes. These attributes are the IP packet identity or fingerprint of the packet and determine if the packet is unique or similar to other packets.

  Traditionally, an IP Flow is based on a set of 5 and up to 7 IP packet attributes.

  IP Packet attributes used by NetFlow:

  +

  IP source address

  +

  IP destination address

  +

  Source port

  +

  Destination port

  +

  Layer 3 protocol type

  +

  Class of Service

  +

  Router or switch interface