Get All The Info On Technology News, and Products
The Internet control message protocol (ICMP) has many types of messages and codes (sub types). The two discussed below are Type 3 - Destination Unreachable, and Type 5 - Redirect as it relates to 1.1.d (i) ICMP unreachable, redirect. Type 3 - Destination Unreachable: This type of message is sent back to the source …
Continue reading "1.1.d (i) ICMP Unreachables, and Redirects"
Microbursts are nanoseconds worth of traffic that are so small most monitoring solutions will not see them (they don't poll often enough). Instead what you may notice is output queue tail drop. This becomes important when discussing how interfaces actually transmit data, on a 1 Gbps interface, a 100 Mbps flow is actually the interface …
Here is the ANKI package for the flash cards: https://upw.io/u4/&1.1.C_Network_Challenges.apkg If you prefer the text, please read below. What is unicast flooding, in simple terms. Unicast flooding is when a switche receives a unicast frame but has no entry in its CAM table for the destination MAC adress, thus treats the frame as broadcast. Simply …
Asymmetric routing is when a packet does not return on the same path it took to the destination. This isn't always an issue, some times it is by design. However there are certain scenarios where it can lead to issues: 1. Asymmetric routing can cause unicast flooding of traffic in very specialized conditions (worse if …
Out of order packets are caused by bad load balancing or per packet load balancing. Technologies like CEF avoid out of order packets by doing a really good PER FLOW load balancing/load sharing. For TCP: Out of order packets to a receiver are a waste of 1. bandwidth and 2. CPU cycles 1. Packets …
Unicast flooding is the result of switch receiving a unicast frame, but not having an entry for the destination MAC address in its CAM table. When a switch receives such frame, it will flood it out of all ports, hence the name unicast flooding. There are a few scenarios where this is common: 1. As …