Cisco 200-125 Online Practice Questions and Exam Preparation

Cisco 200-125 Online Questions & Answers

• Question 101:

  Which two statistics appear in show frame-relay map output? (Choose two.)

  A. the number of BECN packets that are received by the router
  B. the value of the local DLCI
  C. the number of FECN packets that are received by the router
  D. the status of the PVC that is configured on the router
  E. the IP address of the local router
  B. the value of the local DLCI
  D. the status of the PVC that is configured on the router

  ---

  Sample "show frame-relay map" output: R1#sh frame map Serial0/0 (up): ip 10.4.4.1 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active Serial0/0 (up): ip 10.4.4.3 dlci 403(0x193,0x6430), dynamic, broadcast,, status defined, active Serial0/0 (up): ip 10.4.4.4 dlci 401(0x191,0x6410), static, CISCO, status defined, active

• Question 102:

  Which sequence begins a unique local IPv6 address in binary notation?

  A. 1111110
  B. 1111111
  C. 00000000
  D. 1111100
  A. 1111110

• Question 103:

  Which three statements about RSTP are true? (Choose three.)

  A. RSTP significantly reduces topology reconverging time after a link failure.
  B. RSTP expands the STP port roles by adding the alternate and backup roles.
  C. RSTP port states are blocking, discarding, learning, or forwarding.
  D. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
  E. RSTP also uses the STP proposal-agreement sequence.
  F. RSTP uses the same timer-based process as STP on point-to-point links.
  A. RSTP significantly reduces topology reconverging time after a link failure.
  B. RSTP expands the STP port roles by adding the alternate and backup roles.
  D. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

  ---

  One big disadvantage of STP is the low convergence which is very important in switched network. To overcome this problem, in 2001, the IEEE with document 802.1w introduced an evolution of the Spanning Tree Protocol: Rapid Spanning Tree Protocol (RSTP), which significantly reduces the convergence time after a topology change occurs in the network. While STP can take 30 to 50 seconds to transit from a blocking state to a forwarding state, RSTP is typically able to respond less than 10 seconds of a physical link failure. RSTP works by adding an alternative port and a backup port compared to STP. These ports are allowed to immediately enter the forwarding state rather than passively wait for the network to converge.

  RSTP bridge port roles:

  *

  Root port ?A forwarding port that is the closest to the root bridge in terms of path cost

  *

  Designated port ?A forwarding port for every LAN segment

  *

  Alternate port ?A best alternate path to the root bridge. This path is different than using the root port. The alternative port moves to the forwarding state if there is a failure on the designated port for the segment.

  *

  Backup port ?A backup/redundant path to a segment where another bridge port already connects. The backup port applies only when a single switch has two links to the same segment (collision domain). To have two links to the same collision domain, the switch must be attached to a hub.

  *

  Disabled port ?Not strictly part of STP, a network administrator can manually disable a port.

• Question 104:

  Refer to the exhibit.

  

  What is the reason that the interface status is "administratively down, line protocol down"?

  A. There is no encapsulation type configured.
  B. There is a mismatch in encapsulation types.
  C. The interface is not receiving any keepalives.
  D. The interface has been configured with the shutdown command.
  E. The interface needs to be configured as a DTE device.
  F. The wrong type of cable is connected to the interface.
  D. The interface has been configured with the shutdown command.

  ---

  Interfaces can be enabled or disabled with shutdown/no shutdown command. If you interface is down, it will display administratively down status. You can bring up an interface having administratively down interface using no shutdown command.

• Question 105:

  Which subnet address is for the IP address 172.19.20.23/28?

  A. 172.19.20.20
  B. 172.19.20.0
  C. 172.19.20.32
  D. 172.19.20.15
  E. 172.19.20.16
  E. 172.19.20.16

• Question 106:

  Refer to the exhibit.

  

  Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made. Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.)

  A. SwitchA, Fa0/2, designated
  B. SwitchA, Fa0/1, root
  C. SwitchB, Gi0/2, root
  D. SwitchB, Gi0/1, designated
  E. SwitchC, Fa0/2, root
  F. SwitchD, Gi0/2, root
  A. SwitchA, Fa0/2, designated
  B. SwitchA, Fa0/1, root
  F. SwitchD, Gi0/2, root

  ---

  The question says "no other configuration changes have been made" so we can understand these switches have the same bridge priority. Switch C has lowest MAC address so it will become root bridge and 2 of its ports (Fa0/1 and Fa0/2) will

  be designated ports.

  Because SwitchC is the root bridge so the 2 ports nearest SwitchC on SwitchA (Fa0/1) and SwitchD (Gi0/2) will be root ports. Now we come to the most difficult part of this question: SwitchB must have a root port so which port will it choose?

  To answer this question we need to know about STP cost and port cost. In general, "cost" is calculated based on bandwidth of the link. The higher the bandwidth on a link, the lower the value of its cost. Below are the cost values you should

  memorize:

  

  SwitchB will choose the interface with lower cost to the root bridge as the root port so we must calculate the cost on interface Gi0/1 and Gi0/2 of SwitchB to the root bridge. This can be calculated from the "cost to the root bridge" of each switch because a switch always advertises its cost to the root bridge in its BPDU. The receiving switch will add its local port cost value to the cost in the BPDU. One more thing to notice is that a root bridge always advertises the cost to the root bridge (itself) with an initial value of 0. Now let's have a look at the topology again

  

  SwitchC advertises its cost to the root bridge with a value of 0. Switch D adds 4 (the cost value of 1Gbps link) and advertises this value (4) to SwitchB. SwitchB adds another 4 and learns that it can reach SwitchC via Gi0/1 port with a total cost of 8. The same process happens for SwitchA and SwitchB learns that it can reach SwitchC via Gi0/2 with a total cost of 23 -> Switch B chooses Gi0/1 as its root port ->. Now our last task is to identify the port roles of the ports between SwitchA and SwitchB. It is rather easy as the MAC address of SwitchA is lower than that of SwitchB so Fa0/2 of SwitchA will be designated port while Gi0/2 of SwitchB will be alternative port.

  Below summaries all the port roles of these switches:

  

  +

  DP: Designated Port (forwarding state)

  +

  RP: Root Port (forwarding state)

  +

  AP: Alternative Port (blocking state)

• Question 107:

  Which statement describes the effect of the overload keyword in the ip nat inside source list 90 interface ethernet 0/0 overload command?

  A. Addresses that match access listinsideare translated to the IP address of the Ethernet 0/0 interface.
  B. Hosts that match access listinsideare translated to an address in the Ethernet 0/0 network.
  C. Hosts on the Ethernet 0/0 LAN are translated to the address pool in access list90.
  D. Addressesthat match access list90are translated through PAT to the IP address of the Ethernet 0/0 interface.
  D. Addressesthat match access list90are translated through PAT to the IP address of the Ethernet 0/0 interface.

• Question 108:

  Which NTP command configures the local device as an NTP reference clock source?

  A. ntp peer
  B. ntp broadcast
  C. ntp master
  D. ntp server
  C. ntp master

• Question 109:

  Refer to the exhibit.

  

  Given the output from the show ip eigrp topology command, which router is the feasible successor?

  A. 10.1.0.1 (Serial0), from 10.1.0.1, Send flag is 0x0 Composite metric is (46152000/41640000), Route is Internal Vector metric: Minimum bandwidth is 64 Kbit Total delay is 45000 Microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
  B. 10.0.0.2 (Serial0.1), from 10.0.0.2, Send flag is 0x0 Composite metric is (53973248/128256), Route is Internal Vector Metric: Minimum bandwidth is 48 Kbit Total delay is 25000 Microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 1
  C. 10.1.0.3 (Serial0), from 10.1.0.3, Send flag is 0x0 Composite metric is (46866176/46354176), Route is Internal Vector metric: Minimum bandwidth is 56 Kbit Total delay is 45000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
  D. 10.1.1.1 (Serial0.1), from 10.1.1.1, Send flag is 0x0 Composite metric is (46763776/46251776), Route is External Vector metric: Minimum bandwidth is 56 Kbit Total delay is 41000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
  B. 10.0.0.2 (Serial0.1), from 10.0.0.2, Send flag is 0x0 Composite metric is (53973248/128256), Route is Internal Vector Metric: Minimum bandwidth is 48 Kbit Total delay is 25000 Microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 1

• Question 110:

  Drag and drop the benefits of a cisco wireless Lan controller from the left onto the correct examples on the right.

  Select and Place: