What is a function of MAC learning on a switch?
What is a function of MAC learning on a switch?
MAC learning on a switch involves dynamically building a MAC address table (also known as the CAM table) that maps MAC addresses to the ports on which they are learned. When a frame is received for a destination MAC address not listed in the MAC address table, the switch will forward the frame out of all ports except the port on which the frame was received. This is known as flooding and helps to locate the destination device. If the frame is not addressed in the MAC table, it will not be dropped but instead flooded to determine the correct port for that MAC address.
The question specifically says LEARNING. A Static MAC is not learned
Yeah, it is. It learns it from your manual input. This is different to "dynamic learning", i.e. using the source MAC address of an incoming frame, but it's still *learning* it. Put it another way; you're "teaching it" to associate the MAC address with a given interface number. Conversely, it is therefore "learning" from you. Good day sir.
A. Wrong - MAC address learning is generally enabled by default on switches. B. Wrong - in this case the next step would be to replicate the original frame to the remaining ports (flood), in order to find the destination. C. Wrong - MAC learning on a switch (MAC table) is not used to populate the ARP table. MAC learning takes place at the layer 2 level of the OSI model, while the ARP table is related to layer 3, the IP protocol. The ARP table is populated by the host's response frame from the searched IP address destination (ARP reply). D. Correct - in MAC table learning, the addresses are learned by dynamically received frames, but it can also be learned statically, adding manually, when you want to force a destination for a specific host. Perhaps, in this case the static form can be considered a form of learning.
arp is 2 layer protocol
ARP (Address Resolution Protocol) is a layer 2 protocol, not a layer 3 protocol. This is because ARP is used to map a network layer 3 (IP) address to a link layer 2 (MAC) address. It operates at the Data Link Layer of the OSI Model, which is the second layer. It is not considered a layer 3 protocol because it does not deal with routing or managing the flow of data at the network layer.
Even if D is not MAC learning, C is not correct statement. MAC address table has nothing with the ARP table. Only D is true among the selections.
Forget about C, it's D. Do your switches have *AN ARP* table? No.
D is correct a static MAC address is considered as MAC learning as well. also read this https://www.cisco.com/c/en/us/td/docs/optical/cpt/r_972/cpt95_configuration/cpt93_configuration_chapter_01100.pdf (page 12)
Let’s say that host A wants to communicate with host B for the first time. Host A knows the IP address of host B, but since this is the first time the two hosts communicate, the hardware (MAC) addresses are not known. Host A uses the ARP process to find out the MAC address of host B. The switch forwards the ARP request out all ports except the port the host A is connected to. Host B receives the ARP request and responds with its MAC address. Host B also learns the MAC address of host A (because host A sent its MAC address in the ARP request). Host C receives the ARP request, but doesn’t respond since the IP address listed in the request is not its own. https://study-ccna.com/how-switches-work/
It´s D. MAC table is not used to populate ARP table.
C it is
The MAC address table most definitely does NOT populate the ARP table. The ARP table on a L2 switch is for the SVI management interface only.
The answer is D. C can't be the answer because it's definitely not, and adding manually can also belong to 'learning', so the answer is only 'D'..
it is D
D answer is correct.
Arp is not a laser 2 protocol Answer is D because static mac addresses are learned by manual input
MAC learning on a switch involves dynamically building and maintaining a MAC address table (CAM table) that maps MAC addresses to the ports on which they are learned. This table is used to make forwarding decisions based on destination MAC addresses. If a frame is received for a destination MAC address that is not listed in the MAC address table, the switch will flood the frame out of all ports except the port on which the frame was received. This helps prevent unnecessary flooding of frames within the network
C is correct. Address Resolution Protocol (ARP) is a layer 2 protocol used to map MAC addresses to IP addresses. ARP requests are broadcast and sent on the shared local subnet. That is done to update (populate) each ARP table between source and destination. D is incorrect, beacause when you add a static MAC address, it will be (automatically) added to the MAC table.
forget this comment, MAC table dosen´t populate the ARP table, D is correct.
The question is asking what is a "function", answer should be "To built CAM table, so that the switch makes an independent forwarding decision based on it. Unless the question is "How a Switch learns the MAC addresses?" then the answer is D.
By default, MAC address learning is enabled on all interfaces and VLANs on the router. https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/www.cisco.com/content/en/us/td/docs/wireless/mwr_2941_dc/software_config/guide/3_5_1/2941_351_ConfigGuide/mac_lrn.html.xml#:~:text=By%20default%2C%20MAC%20address%20learning,VLANs%20can%20learn%20MAC%20addresses.