Thanks for joining me! I have started this blog as part of my studying journey to become a better network engineer. Currently, I am studying to pass my CCNP, I have already passed my switch exam, however, I have failed the route exam twice now and was let down by a few marks in the … Continue reading The journey begins…sorta!
1.5 – Describe UDP operations
TCP Starvation or UDP dominance TCP starvation or UDP dominance is seen when both TCP and UDP exist on the occupy the same queue as each other. UDP dominance is a bi-product of congestion on the network. During times of congestion, packets are dropped as consequence of this TCP will reduce its window size as … Continue reading 1.5 – Describe UDP operations
1.4 – Explain TCP Operations
IPv4 & IPv6 (P)MTU MTU or Maximum Transmission Unit determine the size of a payload. For ethernet segments, the default MTU is 1500. However when using other technologies such as IP/TCP headers need to be accounted for, an IP header is 20Bytes at its smallest as is TCP so this effectively reduces the MTU to … Continue reading 1.4 – Explain TCP Operations
1.3 – Describe IP Operations
ICMP Unreachable and Redirects ICMP unreachable provide a method for router to inform the source/sending device that the destination they are trying to reach is unreachable, receiving these messages can in some cases allow the source host perform actions based on this information, ICMP Destination Unreachable (Type 3) has six different code types to inform … Continue reading 1.3 – Describe IP Operations
1.2 – Explain General Network Challenges
As networks grow larger and more complex, you may find that you are faced with problems that were not so much of an issue and could be ignored to some extent. Listed below are some of the common challenges that are faced on networks that can lead to performance degradation or full loss of service. … Continue reading 1.2 – Explain General Network Challenges
1.1 – Identify Cisco Express Forwarding Concepts
What? Cisco Express Forwarding is a switching method developed by Cisco, this switching method is the fastest that can be used on a Cisco device. CEF utilises 2 tables to be able to provide 'wirespeed' forwarding, These are the Forward Information Base or FIB for short & the Adjacency table. By default, CEF is enabled … Continue reading 1.1 – Identify Cisco Express Forwarding Concepts
Last Hop Networks 