CCNA 3 Chapter 5 V4.0 Answers

1. Which two criteria does a switch use to select the root bridge? (Choose two.)

bridge priority

switching speed

number of ports

base MAC address

switch location

memory size

 

2. Which two statements are true about the default operation of STP in a Layer 2 switched environment that has redundant connections between switches? (Choose two.)

The root switch is the switch with the highest speed ports.

Decisions on which port to block when two ports have equal cost depend on the port priority and identity.

All trunking ports are designated and not blocked.

Root switches have all ports set as root ports.

Non-root switches each have only one root port.

 

3.

CCNA3Chapter5V4.0Answers1 thumb CCNA 3 Chapter 5 V4.0 Answers
Refer to the exhibit. All switches in the network have empty MAC tables. STP has been disabled on the switches in the network. How will a broadcast frame that is sent by host PC1 be handled on the network?

Switch SW1 will block the broadcast and drop the frame.

Switch SW1 will forward the broadcast out all switch ports, except the originating port. This will generate an endless loop in the network.

Switch SW1 will forward the broadcast out all switch ports, except the originating port. All hosts in the network will reply with a unicast frame sent to host PC1.

Switch SW1 will forward the traffic out all switch ports except the originating port as a unicast frame. All hosts in the network will reply with a unicast frame sent to switch SW1.

 

4. Which two statements describe the BIDs used in a spanning tree topology? (Choose two.)

They are sent out by the root bridge only after the inferior BPDUs are sent.

They consist of a bridge priority and MAC address.

Only the root bridge will send out a BID.

They are used by the switches in a spanning tree topology to elect the root bridge.

The switch with the fastest processor will have the lowest BID.

 

5. Which statement or set of paired statements correctly compares STP with RSTP?

STP and RSTP have the same BPDU format and flag field information.

STP specifies backup ports. RSTP has only root ports, alternate ports, and designated ports.

STP port states are independent of port roles. RSTP ties together the port state and port role.

STP waits for the network to converge before placing ports into forwarding state. RSTP places designated ports into forwarding state immediately.

 

6. How can a network administrator influence which STP switch becomes the root bridge?

Configure all the interfaces on the switch as the static root ports.

Change the BPDU to a lower value than that of the other switches in the network.

Assign a lower IP address to the switch than that of the other switches in the network.

Set the switch priority to a smaller value than that of the other switches in the network.

 

7. In which STP state does a port record MAC addresses but not forward user data?

blocking

learning

disabling

listening

forwarding

 

8. When PVST+ was developed, the Bridge ID was modified to include which information?

bridge priority

MAC address

protocol

VLAN ID

 

9. What is the first step in the process of convergence in a spanning tree topology?

election of the root bridge

blocking of the non-designated ports

selection of the designated trunk port

determination of the designated port for each segment

 

10. What two elements will exist in a converged network with one spanning tree? (Choose two.)

one root bridge per network

all non-designated ports forwarding

one root port per non-root bridge

multiple designated ports per segment

one designated port per network

 

11.

CCNA3Chapter5V4.0Answers2 thumb CCNA 3 Chapter 5 V4.0 Answers
Refer to the exhibit. What can be determined from the output shown?

Two hosts communicating between ports Fa0/2 and Fa0/4 have a cost of 38.

The priority was statically configured to identify the root.

STP is disabled on this switch.

The timers have been altered to reduce convergence time.

 

12. What two features of the Spanning-Tree Protocol contribute to the time it takes for a switched network to converge after a topology change occurs? (Choose two.)

the max-age timer

the spanning-tree hold down timer

the forward delay

the spanning-tree path cost

the blocking delay

 

13. What three link types have been defined for Rapid Spanning-Tree Protocol? (Choose three.)

shared

end-to-end

edge-type

boundary-type

point-to-many

point-to-point

 

14.

CCNA3Chapter5V4.0Answers3 thumb CCNA 3 Chapter 5 V4.0 Answers
Refer to the exhibit. The spanning-tree port priority of each interface is at the default setting. The network administrator enters the spanning-tree vlan 1 root primary command on S4. What is the effect of the command?

Spanning tree blocks Gi0/1 on S3.

Gi0/2 on S3 transitions to a root port.

Port priority makes Gi0/2 on S1 a root port.

S4 is already the root bridge, so there are no port changes.

 

15. In which two ways is the information that is contained in BPDUs used by switches? (Choose two.)

to negotiate a trunk between switches

to set the duplex mode of a redundant link

to identify the shortest path to the root bridge

to prevent loops by sharing bridging tables between connected switches

to determine which ports will forward frames as part of the spanning tree

 

16. What Rapid Spanning Tree Protocol (RSTP) role is assigned to the forwarding port elected for every Ethernet LAN segment that links two switches?

alternate

backup

designated

edge

 

17. Which two items are true regarding the spanning-tree portfast command? (Choose two.)

PortFast is Cisco proprietary.

PortFast can negatively effect DHCP services.

PortFast is used to more quickly prevent and eliminate bridging loops.

Enabling PortFast on trunks that connect to other switches improves convergence.

If an access port is configured with PortFast, it immediately transitions from a blocking to a forwarding state.

 

18. Which two actions does an RSTP edge port take if it receives a BPDU? (Choose two.)

immediately loses its edge status

inhibits the generation of a TCN

goes immediately to a learning state

disables itself

becomes a normal spanning-tree port

 

19.

CCNA3Chapter5V4.0Answers4 thumb CCNA 3 Chapter 5 V4.0 Answers
Refer to the exhibit. Server sends an ARP request for the MAC address of its default gateway. If STP is not enabled, what will be the result of this ARP request?

Router_1 will drop the broadcast and reply with the MAC address of the next hop router.

Switch_A will reply with the MAC address of the Router_1 E0 interface.

Switch_A and Switch_B will continuously flood the message onto the network.

The message will cycle around the network until its TTL is exceeded.

 

20. Which three statements are accurate regarding RSTP and STP? (Choose three.)

RSTP uses a faster algorithm to determine root ports.

RSTP introduced the extended system ID to allow for more than 4096 VLANs.

Both RSTP and STP use the portfast command to allow ports to immediately transition to forwarding state.

Like STP PortFast, an RSTP edge port that receives a BPDU loses its edge port status immediately and becomes a normal spanning-tree port.

Configuration commands to establish primary and secondary root bridges are identical for STP and RSTP.

Because of the format of the BPDU packet, RSTP is backward compatible with STP.

ccna 3 chapter 5, Refer to the exhibit Which two switch interfaces would be RSTP edge ports? (Choose two ), CCNA 3, What Rapid Spanning Tree Protocol (RSTP) role is assigned to the forwarding port elected for every Ethernet LAN segment that links two switches?, cisco chapter 6, ccna3 chapter 5, Which three statements accurately describe VLAN types? (Choose three), CCNA 3 chapter 5 exam answers, ccna3 chapter 5 answers, Refer to the exhibit Which two switch interfaces would be RSTP edge ports?

18 Responses - Add Yours+

  1. sisqo says:

    I think number 20 should be the last three – RSTP wouldn’t use the portfast command.

  2. imnottelling says:

    The Cisco RSTP implemetation maintains the portfast keyword using the spanning-tree portfast command for edge port configuration to make it easier for overall network transition to RSTP

  3. hbo says:

    I got 97.6% here.
    The one thing that I am very sure of in the number 20 is “Like STP PortFast, an RSTP edge port that receives a BPDU loses its edge port status immediately and becomes a normal spanning-tree port.” I don’t know about the other two answers :)) Goodluck! Please do post the correct one!

    • Mat says:

      No that is not a good answer. I have a 100% with the answer above in red. I beleive if you configure port fast in STP, it will stay like that.

  4. Cesar says:

    I think number 14, option “Spanning tree blocks Gi0/1 on S3.” is true too.

  5. Balot says:

    Refer to the exhibit. The spanning-tree port priority of each interface is at the default setting. The network administrator enters the spanning-tree vlan 1 root primary command on S4. What is the effect of the command?
    • Gi0/2 on S3 transitions to a root port.
    why • Gi0/2 on S3 transitions to a root port. is the answer not • S4 is already the root bridge, so there are no port changes.

  6. P!45h! M09 says:

    100% Correct. Above All answer in Red.
    I took the Exam on Oct 7, 2012

  7. Steve says:

    100% using all answers given above. Question #20 is #2,4 & 5.

    Dec 8th, 2012

  8. Steve says:

    Oh, and thanks so much for making this available! I have studied hard and I like having a backup to make sure I keep a 4.0, your help is very much appreciated!

  9. newbie says:

    Thanks guys, 100%!!!
    19/02/13 using netspace

  10. Winnie ayuma says:

    all the answers are correct,thanks so much 4 this blog it has rely help me to review my work,i appreciate it

  11. Salena Hunt says:

    What command can we use to prevent the issue of host not receiving a DHCP address because of STP convergence time?

    I Help Help With This..

  12. Raja says:

    Question #20 is #3,5 & 6. All Answer Given was correct.

    Tested. I Get 100%. No issue.

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