Author: geekbacon

Used to be called “bridges.” Recall that there are really three types of network equipment: Hubs/Repeaters – Layer 1 devices that just forward everything blindly, including collisions/errors. Bridges/Switches...

Adjusting window size and window scaling options, and buffers (mbufs). FreeBSD kern.ipc.maxsockbuf=262144 net.inet.tcp.rfc1323=1 kern.ipc-nmbclusters=32768 Linux net.core.wmem_max=8388608 net.ipv4.tcp_window_scaling=1...

Ethernet only deals with MAC addresses. It doesn’t involve any routing or packets. It works with Frames. Ethernet Frame: Preamble – Start bits Destination (6 bytes) – Destination MAC address Source (6 bytes)...

Fiber Multimode Fiber Singlemode Fiber Fiber Connectors SC ST LC Fiber Interfaces GBIC SFP Fiber transmitter/receivers SX LX ZX WDM Copper Ethernet Panels – 568A Straight-through – 568B Modern switches/cards...

Layer 1 – Physical This is where the electrical bits are generated. Either for wired, wireless, or fiber connections. These are the electrical pulses that create the 1’s and 0’s.  Wiring Fiber Network Cards...