The answers should be
DSW1(config)#spanning-tree vlan 10 priority 4096 < -- This is listed
DSW1(config)#spanning-tree vlan 10 priority root < -- this is not valid
DSW1(config)#spanning-tree vlan 10 root primary < -- This is not listed, but should be the correct command
Yes. A&C
61440 is a valid (and "low/bad") priority
SW1(config)#spanning-tree vlan 10 priority 32767
% Bridge Priority must be in increments of 4096.
% Allowed values are:
0 4096 8192 12288 16384 20480 24576 28672
32768 36864 40960 45056 49152 53248 57344 61440
Option B is not correct. it is just simmilar to:
spanning-tree vlan 10 root primary
Bridge priority must be multiples of 4096 (default is 32,768)
The bridge with the lowest priority value becomes the root bridge.
Option 'A' ensures that DSW1 is selected as the "root" bridge.
Option 'C' also ensures that switch "DSW1" is the root bridge by modifying DSW2 priority.
We can use either of these 2 methods to influence the root bridge selection.
Option B uses the wrong syntax, it should be "DSW1(config)#spanning-tree vlan 10 root"
Option D is incorrect, port priority is configured under the interface settings "DSW1(config-if)# spanning-tree VLAN 10 port-priority 0" which is used to influence root port selection in non-root bridges.
Option E ensures DSW2 is the root for VLAN 20 which doesn't match our requirement.
In option B, you must specify that the root is primary (we have primary and secondary roots).
"DSW1(config)#spanning-tree vlan 10 root primary" With this command, DSW1 will look for the primary root, which is DSW2 in our case. It will check DSW2’s priority of 24,576 and set its own priority to a lower multiple of 4,096, which is 20,480.
https://www.ciscopress.com/articles/article.asp?p=2995351&seqNum=2#:~:text=You%20can%20modify%20the%20port,VLAN%2Dby%2DVLAN%20basis.
https://networklessons.com/spanning-tree/spanning-tree-root-bridge-configuration
A. is correct: the lower prio will win
B is not correct due to there is missing subcommand after root (primary/secondary)
Switch(config)#spanning-tree vlan 10 root ?
primary Configure this switch as primary root for this spanning tree
secondary Configure switch as secondary root
C is correct, if you modifiy DSW2 prio to 61440 DSW1 will have the best prio
Option B is not valid, priority is an integer number (with steps of 4096). You can make the switch root by making the statement: "spanning-tree vlan 10 root" but without priority.
SW1(config)#spanning-tree vlan 10 ?
forward-time Set the forward delay for the spanning tree
hello-time Set the hello interval for the spanning tree
max-age Set the max age interval for the spanning tree
priority Set the bridge priority for the spanning tree
root Configure switch as root
B is no correct.
DSW1(config)#spanning-tree vlan 10 priority ?
<0-61440> bridge priority in increments of 4096
DSW1(config)#spanning-tree vlan 10 priority root
^
% Invalid input detected at '^' marker.
Switch(config)#spanning-tree vlan 10 priority ?
<0-61440> bridge priority in increments of 4096
0 Is the lowest possible so the best available priority for the STP root bridge election.
choosing A and C give two values to vlan 10 in DSW1(4096) and DSW2(61440) The root bridge is chosen based on the lowest bridge priority value, with the switch having the lowest priority becoming the root bridge and in this case DSW1 (496)
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