Given the above partial configuration, which two statements are true about VLAN traffic?
(Choose two.)
A.
VLANs 1-5 will use fa0/10 as a backup only.
B.
VLANs 6-10 will use fa0/10 as a backup only.
C.
VLANs 1-5 will be blocked if fa0/10 goes down.
D.
VLANs 1-10 are configured to load share between fa0/10 and fa0/12.
E.
VLANs 6-10 have a port priority of 128 on fa0/10.
Explanation:
Spanning-Tree Protocol (STP) is a Layer 2 protocol that utilizes a special-purpose algorithm
to discover physical loops in a network and effect a logical loop-free topology. STP creates a
loop-free tree structure consisting of leaves and branches that span the entire Layer 2network. The actual mechanics of how bridges communicate and how the STP algorithm
works will be discussed at length in the following topics. Note that the terms bridge and
switch are used interchangeably when discussing STP. In addition, unless otherwise
indicated, connections between switches are assumed to be trunks.
Load sharing can be accomplished using a couple of methods. The most common method of
load sharing is through root bridge placement on a per-VLAN basis. This will distribute traffic
for separate VLANs across separate paths to different root bridges. A separate method
divides the bandwidth supplied by parallel trunks connecting switches. To avoid loops, STP
normally blocks all but one parallel link between switches. Using load sharing, traffic can be
divided between the links according to which VLAN the traffic belongs.
Load sharing can be configured on trunk ports by using STP port priorities or STP path
costs. For load sharing using STP port priorities, both load-sharing links must be connected
to the same switch. For load sharing using STP path costs, each load-sharing link can be
connected to the same switch or to two different switches.
Load Sharing Using STP Port Priorities
When two ports on the same switch form a loop, the STP port priority setting determines
which port is enabled and which port is in a blocking state. The priorities on a parallel trunk
port can be set so that the port carries all the traffic for a given VLAN. The trunk port with the
higher priority (lower values) for a VLAN is forwarding traffic for that VLAN. The trunk port
with the lower priority (higher values) for the same VLAN remains in a Blocking state for that
VLAN. One trunk port sends or receives all traffic for the VLAN.
d, e
b,d
The default value for the port priority is 32
b,e. default port priority is 128, not 32.
b,d
The default priority is 32768
Image is wrong, first it’s missing the – between port and prioty, and secondly, port-priority can’t be 10. The default port priority is 128 and works with increments of 32 (1-224)
proof:
Switch(config-if)#spanning-tree vlan 1-5 port-priority 10
% Port Priority in increments of 32 is required
http://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/l2/spanning-tree-port-priority.html
New 300-115 Exam Questions and Answers Updated Recently (4/July/2017):
NEW QUESTION 391
In which two ways can a port respond to a port-security violation? (Choose two.)
A. The port enters the en-disabled state.
B. The Security Violation counter is incremented and the port sends an SNMP trap.
C. The Security Violation counter is incremented and the port sends a critical syslog message to the console.
D. The port triggers an EEM script to notify support staff and continues to forward traffic normally.
E. The port immediately begins to drop all traffic.
F. The port enters the shutdown state.
Answer: AF
NEW QUESTION 392
Which three functions does Dynamic ARP Inspection perform with invalid IP-to MAC address bindings? (Choose three.)
A. accepts
B. deletes
C. discards
D. bypasses
E. intercepts
F. logs
Answer: CEF
NEW QUESTION 393
Which two statements about 802.1Q are true? (Choose two.)
A. It encapsulates the original Ethernet frame and adds a VLAN identifier.
B. It increases the maximum size an Ethernet frame to 1094 bytes.
C. It is a Cisco proprietary protocol.
D. When It is enabled, it forces a recalculation of the frame check sequence field.
E. It supports 8-byte VLAN identifiers.
F. It adds a 32-bit field to the Ethernet frame between the source MAC address and length fields.
Answer: DF
NEW QUESTION 394
A physical switch port is part of an EtherChannel group. What happenes while the same port configured as a SPAN destination?
A. The port forwards traffic in the EtherChannel group and acts as a SPAN source simultaneously.
B. The port is removed from the EtherChannel group.
C. The port is put in the errdisabled state and can only be reenabled manually.
D. The operation is not allowed as an EtherChannel member cannot be a SPAN source port.
Answer: D
NEW QUESTION 395
Which two statements about CDP are true? (Choose two.)
A. CDP uses a TLV to advertise the native VLAN
B. CDP is not supported with SNMP
C. CDP is supported on Frame Relay sub interfaces.
D. CDP runs on OSI layer 2
E. CDP runs on OSI layer 1
Answer: AC
NEW QUESTION 396
Which two combinations of Ether Channel modes support the formation of an EtherChannel? (Choose two.)
A. desirable, passive
B. desirable, desirable
C. active, passive
D. passive, passive
E. active, desirable
Answer: BC
NEW QUESTION 397
……
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