I'm a freshman in this forum and also in the cisco career certification. I just passed the CCNA exam last week, but there are still some quetions confusing me, Would you like to give me some help? Thanks in advance
First is about switch: Does each port in a switch have it's own MAC address?
if does, will the receiving port change the source address in the frame through it to another port? if doesn't , then in a network with two or more switches, how to deal with the data transmitting through many switches?
Second is about VLAN: what is the main difference between the VLAN and the subnet in conception , in functionality, and in practice?
Switches have one mac address commonly. Unless the data is destined for the switch itself it changes nothing in the frame. Just builds switching tables (MAC/port).
VLAN: Layer 2
Subnet: Layer 3
Normally a VLAN can be seen as a grouping of L2 ports/switches that encompass one broadcast domain and a subnet is a L3 concept which lives in this broadcast domain. Switches provide L2 connectivity while routers allow communication between L3 subnetworks.
each switch port has the mac address. but it is used in the switches communication like spanning-tree etc. When the switches received the packets, like looks the destination mac address, if the switches know the mac address it forwards to that port which it is pointing to,if not, it will forward to all the ports except the one he learned itself. and if the source mac address is not present in the bridge table, it 'll put the entry for the source mac address.
Vlan separeates the broadcast domain- vlan is just like the interface on the router- used to be each switch can part of one lan- broadcast domain but with vlans, one switch can part of many vlans.. you can define virtual vlans (VLAN) upto 1024 per switch like cat6000 - which is not possible one router.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...