Identifying Ethernet Header Types
There are 3 different Ethernet Header types defined by the IEEE and in use today. So, one question comes to mind: When a Ethernet receiver receives a frame, how does it know what kind of header it is?...
View ArticleIdentifying Ethernet Multicast
Just like there are 3 different Ethernet header types, there are also 3 different types of Ethernet addresses: Unicast Broadcast Multicast A unicast frame contains the unique MAC address of the...
View ArticleThings to know about VTP
Some notes about VTP (VLAN Trunking Protocol): Cisco switches running Cisco IOS store VTP and VLAN information in a separate database stored in Flash, in file called vlan.dat. Cisco switches running...
View ArticleVLAN Trunking using ISL
Inter-Switch Link (ISL) is a Cisco specific implementation of trunking multiple VLANs between two Cisco switches where a single interface will carry traffic for more than one VLAN. ISL was designed to...
View ArticleVLAN Trunking using IEEE 802.1Q
IEEE 802.1Q (sometimes referred to as 1Q or DOT1Q) is a industry standards based implementation of carring traffic for multiple VLANs on a single trunking interface between two Ethernet switches....
View ArticleSwitchport Configurations Explained
It always helps me to think of the English translation when trying to memorize and understand some the Cisco IOS settings I think are important. Here are some Cisco IOS switchport configurations...
View ArticleCCIE R&S Written Test Study Notes – Part 1
Well, it’s that time again. Time to re-certify my CCIE R&S certification by passing the written test. To prepare for the re-certification test I am reading from the book CCIE Routing and Switching...
View ArticleRe-certified
I passed the 350-001 Routing & Switching Exam to re-certify my CCIE status. This was the new 3.1 version of the test with 105 questions. I can tell you that this test is no walk in the park, they...
View Article
