Will Source MAC change while sending packets within same VLAN?

Question

In given network, two geographically apart segments are configured as in same VLAN (ie, VLAN1).

A is sending packets to B and C.

a) What will be the source MAC ID mentioned in the frames received by B?

b) What will be the source MAC ID mentioned in the frames received by C?

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a) MAC of A, MAC of A

b) MAC of A, MAC of router

c) MAC of router, MAC of A

d) MAC of router, MAC of router

Answer 1

a) A is sending packet to B:

Here Switch is used to connect them.

Switch doesn't changes the MAC address in the network.

So When the packet is received , it have $\color{purple} {Source  \: as \: MAC \:of \:A}$

b)A is sending packet to C:

Here Router is involved to connect A and C.

At  A:     

 , We have Source MAC as A's MAC and Destination Mac as R1's MAC

When it reaches R1, Router change MAC addresses like

When this is received at C ,we will have  $\color{blue} {\:Source\: as\: MAC\:of\: Router}$