Nakrule
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Why the first octet of a MAC address always end with a binary 0?
8 votes

First, the far most right bit of a byte is the first bit (and not the 8th). And as often in IT fields, first means 0 and not 1. Now, to answer your question, the bit 0 of the first byte of a mac ...

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What happens when a switch receives a packet with an unknown source MAC address?
Accepted answer
6 votes

A switch dynamically builds the MAC address table by examining the source MAC address of the frames received on a port. The switch forwards frames by searching for a match between the destination MAC ...

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Why can my ISP use 172.39.29.71 as local network IP?
6 votes

172.16.0.0/12 goes from 172.16.0.0 to 172.31.255.255. Therefore, 172.39.29.71 is a public IPv4.

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Does every router in public network knows all the other public interconnected networks in the world?
4 votes

the Routing Table is a map of every network that exists Yes, this is more or less true. However, the every network that exists does not mean every network in the whole world. From your first picture,...

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How do devices connected to a switch get their IPs?
4 votes

There are two ways: You manually (statically) configure each device with an IP, a subnet mask, a default gateway and a DNS server. If you have 20 devices, you do it 20 times. The device is auto ...

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Why the ARP packet contains values like "Physical Address length" etc?
Accepted answer
4 votes

From Wikipedia: ARP has been implemented with many combinations of network and data link layer technologies, such as IPv4, Chaosnet, DECnet and Xerox PARC Universal Packet (PUP) using IEEE 802 ...

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Router Extended Access Control List
Accepted answer
3 votes

You can place an extended ACL where you want (as long as it is in the path of the packet you want to filter of course). However, depending on the filtering parameters, it is usually better to put it ...

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the use cases of network function virtualization infrastructure?
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1 votes

An NFVI is a cloud optimized for service providers grade networking functions. For example, the networking layer of OpenStack use Open vSwitch, which was only capable of 4 Gb/s of throughput all the ...

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Is destination MAC address is always end point MAC address?
1 votes

The destination MAC is always the next hop on that subnet, which may or not be the final endpoint. As you said, if the final destination is on another subnet, the sending device will use it's default ...

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Do routers understand transport protocol?
Accepted answer
0 votes

Routers are layer 3 devices because they transport packets at the layer 3 (mostly IP). A switch is considered a layer 2 devices because it transport frames at the layer 2 (mostly Ethernet). This means ...

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How to ping router from L3 switch
0 votes

You need to configure router-on-a-stick. interface FastEthernet0/1 switchport trunk allowed vlan 2-11 switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiate Router(...

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How to configure NAT between 2 private network ? CISCO routers
0 votes

As Zac67 said, a tunnel suits your use case better. Here is an example with GRE on your router1: interface tunnel0 tunnel source 12.0.0.1 tunnel destination 12.0.0.2 ip address 192.168.3.1 ...

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