As you may tell by the blog title, I took my CCIE R&S Written test today and did not come out victorious. Without breaking any NDA’s, I just barely failed, which usually would upset me, but I know where my faults are and where I did very well. I also attempted to take a test […]
EIGRP Feature Summary EIGRP Updates Once routers are adjacent, they can exchange EIGRP update messages, which follow; EIGRP uses Reliable Transport Protocol (RTP) to send multicast EIGRP updates. EIGRP sends updates and waits for a unicast ACK reply from the neighbor the update was sent. If an ASK is not received in the Retransmission Timeout
IP forwarding is how packets go from one side of the network to the other. It is also known as IP routing. So we can have a base understanding, let’s look at the diagram below. How does the R3 know how to forward the telnet packet to R1? Fast Switching and Cisco Express Forwarding (CEF)
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When dealing with IP services, you deal with service elements of the IP protocol carried on the IP datagram stream. Some of the IP services we are looking at; ARP We are first going to look at ARP. ARP maps IP addresses to MAC addresses. Before a host can send data, it must do an
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Whether we are talking about EtherChannels or PortChannels, we are talking about the same technology. That technology is a way to allow you to treat multiple physical links as one link to Spanning-Tree, and you can also do some load-balancing on them. There are two types of port channels. They can be a layer 2
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Spanning-Tree is a layer 2 loop detection mechanism for a switched network. There are several spanning-tree standards Cisco also has two proprietary types of spanning tree; One of the most important pieces of a spanning tree is electing a root switch. You can leave the election up to chance or “rig” the election how you
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I remember all the insanely complicated things in my studies but forget the little stupid things. This is going to be a quick compile of my CCIE notes for VLAN’s A VLAN is a Layer 2 technology that shrinks the broadcast domain in your inter-network. If there were no VLANs, depending on the size of
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Well, I am back.. I just finished typing up my notes for CCIE R&S, and I have a lot to say. It turned out to be 210 pages, so I have a hard copy next to me, and there will be some more reading and blogging happening soon :). On a better note, I scheduled
Many people don’t understand a private VLAN and when to use it. I will try to explain what it is and how to implement it properly. A private VLAN can block host-to-host communication at layer 2, only allowing them to talk to their default gateway. I say essentially out of their broadcast domain because a
VLAN Trunking Protocol, or VTP, is a Cisco proprietary protocol allowing you to pass VLAN information between switches. There are three modes that VTP can be configured in VTP Server mode is the default, and it will send VTP updates to other VTP servers or client devices over a trunk or port channel. VTP Client
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