How Arp works in Linux

  To understand how ARP translates IP addresses to MAC addresses, consider the following example. Assume host A has an IP address of 192.0.2.5/24 and a MAC address of fc:99:47:49:d4:a0, and wants to send a packet to host B with an IP address of 192.0.2.7. Note that the network number is the same for both hosts, so host A is able to send frames directly… Continue reading How Arp works in Linux

How Vlan works in plain language

To understand how VLANs work, let’s consider VLAN applications in a traditional IT environment, where physical hosts are attached to a physical switch, and no virtualization is involved. Imagine a scenario where you want three isolated networks but you only have a single physical switch. The network administrator would choose three VLAN IDs, for example,… Continue reading How Vlan works in plain language

The meanings of SR、LRM、LR、ER and ZR

SR、LRM、LR、ER、ZR are terms used in fiber optic communications, stand for the transmission distance of the 10G modules. SR stands for Short Range, these transceivers support link length of 300m over multi-mode fiber and use 850nm lasers. LRM means Long Reach Multimode, these transceivers support distance up to 220m over multi-mode fiber and use 1310nm lasers.… Continue reading The meanings of SR、LRM、LR、ER and ZR