cisco ccna routing and switching

ch1-Spanning Tree Protocol Concepts

An Ethernet frame arrives at switch SW1, entering on port F0/1. F0/1 does not trunk. SW1 forwards the frame out F0/
2. Which of the following statements is true about the logic SW1 uses when forwarding the frame?

A. Forward based on MAC table entries for the F0/1’s access VLAN
B. Forward based on MAC table entries for the F0/1’s native VLAN
C. Forward based on MAC table entries for the F0/2’s access VLAN
D. Forward based on MAC table entries in all VLANs

ch1-STP Concepts

Consider the following command output:

SW1# show interfaces f0/11 statusPort          Name                    Status          Vlan          Duplex     Speed TypeFa0/11                                 connected          3          a-full            100 10/100BaseTX

A frame arrives on this same switch’s port F0/1, an access port in VLAN 3. The frame is destined to MAC address FFFF.FFFF.FFFF. Which of the following statements is true, based on the information about F0/11 in the show command output, about whether SW1 will forward the frame out port F0/11?

a.The output confirms that SW1 will definitely forward the frame out F0/11.
b.The output confirms that SW1 will definitely not forward the frame out F0/11.
c.The output confirms that it is possible for SW1 to forward the frame out F0/11, but not definitely.

ch1-STP Concepts

Which of the following IEEE 802.1D port states are stable states used when STP has completed convergence? (Choose two answers.)

a.Blocking
b.Forwarding
c.Listening
d.Learning
e.Discarding

ch1-STP Concepts

Which of the following are transitory IEEE 802.1D port states used only during the process of STP convergence? (Choose two answers.)

a.Blocking
b.Forwarding
c.Listening
d.Learning
e.Discarding

ch1-STP Concepts

Which of the following bridge IDs win election as root, assuming that the switches with these bridge IDs are in the same network?

A. 4097:0200.2222.2222
B. 40961:0200.1111.1111
C. 4097:0200.1111.1111
D. 32769:0200.1111.1111
E. 32769:0200.2222.2222

ch1-STP Concepts

Which of the following facts determines how often a nonroot bridge or switch sends an 802.1D STP hello BPDU message?

A. It is always every 2 seconds.
B. The hello timer as configured on the root switch.
C. The switch reacts to BPDUs received from the root switch by sending another BPDU 2 seconds after receiving the root BPDU.
D. The hello timer as configured on that switch.

ch1-STP Concepts

What STP feature causes an interface to be placed in the forwarding state as soon as the interface is physically active?

A. EtherChannel
B. PortFast
C. STP
D. Root Guard

ch2-STP implem/

On a 2960 switch, which of the following commands change the value of the bridge ID? (Choose two answers.)

a.spanning-tree bridge-id value
b.spanning-tree vlan vlan-number root {primary | secondary}
c.spanning-tree vlan vlan-number priority value
d.set spanning-tree priority value

ch2-STP implem/

2.Examine the following extract from the show spanning-tree command on a Cisco switch:Bridge ID    Priority       32771       (priority 32768 sys-id-ext 3)                   Address        0019.e86a.6f80

Which of the following answers is true about the switch on which this command output was gathered?

A. The information is about the STP instance for VLAN 1.
B. The information is about the STP instance for VLAN 3.
C. The command output confirms that this switch cannot possibly be the root switch.
D. The command output confirms that this switch is currently the root switch.

ch2-STP implem/

A switch’s G0/1 interface, a trunk that supports VLANs 1-10, has autonegotiated a speed of 100 Mbps. The switch currently has all default settings for STP. Which of the following actions results in the switch using a STP cost of 19 for that interface in VLAN 3? (Choose two answers.)

a.spanning-tree cost 19
b.spanning-tree port-cost 19
c.spanning-tree vlan 3 port-cost 19
d.Adding no configuration

ch2-STP implem/

An engineer configures a switch to put interfaces G0/1 and G0/2 into the same EtherChannel. Which of the following terms is used in the configuration commands?

A. Channel-group
B. PortChannel
C. Ethernet-Channel
D. EtherChannel

ch2-STP implem/

Switch SW3 is receiving only two hello BPDUs, both from the same root switch, received on the two interfaces listed as follows:

SW3# show interfaces statusPort         Name          Status             Vlan         Duplex         Speed         TypeFa0/13                      connected        1              a-half           a-100          10/100BaseTXGi0/1                        connected        1              a-full            a-1000        1000BaseTX

SW3 has no STP-related configuration commands. The hello received on Fa0/13 lists root cost 10, and the hello received on Gi0/1 lists root cost 20. Which of the following is true about STP on SW3?

A. SW3’s Gi0/1 will become a designated port.
B. SW3 will choose Gi0/1 as its root port.
C. SW3 will choose Fa0/13 as its root port.
D. SW3’s Fa0/13 will become a designated port.

ch2-STP implem/

Which of the following commands lists a nonroot switch’s root cost? (Choose two answers.)

ch3-trbsh/ LAN sw/