CCNA 2 v7 Modules 5 – 6: Redundant Networks Flashcards
What additional information is contained in the 12-bit extended system ID of a BPDU?
MAC address
VLAN ID
IP address
port ID
VLAN ID
During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?
Each switch with a lower root ID than its neighbor will not send BPDUs.
All the switches send out BPDUs advertising themselves as the root bridge.
Each switch determines the best path to forward traffic.
Each switch determines what port to block to prevent a loop from occurring.
All the switches send out BPDUs advertising themselves as the root bridge.
Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?
designated port
root port
alternate
disabled port
root port
Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)
bridge ID
edge port
extended system ID
PortFast
PVST+
edge port
PortFast
Which three components are combined to form a bridge ID?
extended system ID
cost
IP address
bridge priority
MAC address
port ID
extended system ID
bridge priority
MAC address
Match the STP protocol with the correct description. (Not all options are used.)
Rapid PVST+
STP
MSTP
the legacy standard for STP that runs
all VLANs in a single spanning-tree
instance
a protocol that allows multiple VLANs
to run in a single spanning-tree
instance
a Cisco enhancement of RSTP to
provide a spanning-tree instance for
each VLAN
an evolution of STP that provides
faster convergence
the legacy standard for STP that runs
all VLANs in a single spanning-tree
instance
STP
a protocol that allows multiple VLANs
to run in a single spanning-tree
instance
MSTP
a Cisco enhancement of RSTP to
provide a spanning-tree instance for
each VLAN
Rapid PVST+
In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)
disabled
forwarding
listening
blocking
learning
forwarding
learning
If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?
lowest MAC address
lowest IP address
highest IP address
highest MAC address
lowest MAC address
Match the spanning-tree feature with the protocol type. (Not all options are used.)
Proprietary per VLAN implementation of IEEE 802.1w
Cisco implementation of IEEE 802.1D
Fast converging enhancement of IEEE 802.1D
IEEE standard that reduces the number of STP instances
PVST+
RSTP
MSTP
MST
Rapid PVST+
Proprietary per VLAN implementation of IEEE 802.1w -> Rapid PVST+
Cisco implementation of IEEE 802.1D -> PVST+
Fast converging enhancement of IEEE 802.1D -> RSTP
IEEE standard that reduces the number of STP instances -> MSTP
When the show spanning-tree vlan 33 command is issued on a switch, three ports are shown in the forwarding state. In which two port roles could these interfaces function while in the forwarding state? (Choose two.)
alternate
designated
disabled
blocked
root
designated
root
What is the function of STP in a scalable network?
It decreases the size of the failure domain to contain the impact of failures.
It protects the edge of the enterprise network from malicious activity.
It combines multiple switch trunk links to act as one logical link for increased bandwidth.
It disables redundant paths to eliminate Layer 2 loops.
It disables redundant paths to eliminate Layer 2 loops.
What is a characteristic of spanning tree?
It is enabled by default on Cisco switches.
It is used to discover information about an adjacent Cisco device.
It has a TTL mechanism that works at Layer 2.
It prevents propagation of Layer 2 broadcast frames.
It is enabled by default on Cisco switches.
Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?
PVST+
802.1D
MST
Rapid PVST
802.1D
What is the purpose of the Spanning Tree Protocol (STP)?
creates smaller collision domains
prevents routing loops on a router
prevents Layer 2 loops
allows Cisco devices to exchange routing table updates
creates smaller broadcast domains
prevents Layer 2 loops
What is the value used to determine which port on a non-root bridge will become a root port in a STP network?
the path cost
the highest MAC address of all the ports in the switch
the lowest MAC address of all the ports in the switch
the VTP revision number
the path cost
Refer to the exhibit. Which switch will be the root bridge after the election process is complete?
S1———S2
| |
S3———S4
S1
S2
S3
S4
S2
What are two drawbacks to turning spanning tree off and having multiple paths through the Layer 2 switch network? (Choose two.)
The MAC address table becomes unstable.
The switch acts like a hub.
Port security becomes unstable.
Broadcast frames are transmitted indefinitely.
Port security shuts down all of the ports that have attached devices.
The MAC address table becomes unstable.
Broadcast frames are transmitted indefinitely.
A small company network has six interconnected Layer 2 switches. Currently all switches are using the default bridge priority value. Which value can be used to configure the bridge priority of one of the switches to ensure that it becomes the root bridge in this design?
1
28672
32768
34816
61440
28672
Refer to the exhibit. The administrator tried to create an EtherChannel between S1 and the other two switches via the commands that are shown, but was unsuccessful. What is the problem?
S1======S2
\ //
S3
S1 (config)# interface range fa0/1 - 4
S1 (config-if-range) # channel-group 1 mode on
Traffic cannot be sent to two different switches through the same EtherChannel link.
Traffic cannot be sent to two different switches, but only to two different devices like an EtherChannel-enabled server and a switch.
Traffic can only be sent to two different switches if EtherChannel is implemented on Gigabit Ethernet interfaces.
Traffic can only be sent to two different switches if EtherChannel is implemented on Layer 3 switches.
Traffic cannot be sent to two different switches through the same EtherChannel link.
Which statement is true regarding the use of PAgP to create EtherChannels?
It requires full duplex.
It increases the number of ports that are participating in spanning tree.
It requires more physical links than LACP does.
It mandates that an even number of ports (2, 4, 6, etc.) be used for aggregation.
It is Cisco proprietary.
It is Cisco proprietary.
What are two requirements to be able to configure an EtherChannel between two switches? (Choose two.)
All the interfaces need to work at the same speed.
All interfaces need to be assigned to different VLANs.
Different allowed ranges of VLANs must exist on each end.
All the interfaces need to be working in the same duplex mode.
The interfaces that are involved need to be contiguous on the switch.
All the interfaces need to work at the same speed.
All the interfaces need to be working in the same duplex mode.
Refer to the exhibit. On the basis of the output that is shown, what can be determined about the EtherChannel bundle?
S_ATC_1.1# show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group | Port-channel | Protocol | Ports
1 |Po1 (SU) | PAqP | Fa0/1(P) Fa0/2(P)
The EtherChannel bundle is down.
Two Gigabit Ethernet ports are used to form the EtherChannel.
A Cisco proprietary protocol was used to negotiate the EtherChannel link.
The EtherChannel bundle is operating at both Layer 2 and Layer 3.
A Cisco proprietary protocol was used to negotiate the EtherChannel link.