It’s been a miserable couple of weeks. I was miserably sick last week, and before that I was nutty with work projects needing me to be there in the middle of the night. But I’m back. Life has settled sort of back into the normal groove. And I have 3 chapter’s worth of write-ups to […]
These are facts I did not know (or was unsure of) that I picked up while going through the CD-ROM testing engine for chapters 1-6. Take this with a grain of salt, as these testing engines are notorious for technical errors.
The OECG book came with a CD-ROM that’s got a Boson test engine on it. You can test on specific book categories. So, starting tomorrow night, that’s what I’m going to. I’m going to work on sample questions from the test engine, and brush up on the weak spots. I’ll note down in a post […]
passive mode FTP – an FTP mode where the server dynamically allocates a port and the client opens a socket to that port from a port he dynamically allocated. active mode FTP – an FTP mode where the client dynamically allocates a port, and the server opens a socket to that port from his source […]
On to some of the common applications that ride on TCP and UDP. The author touches on FTP (active and passive modes), SSL/HTTPS/TLS just briefly, and closes with SNMP. Accompanied by Beethoven’s Rondo from Piano Concerto No. 2, I soldier on. Quickly, I might add, as the morning will find me at work at 4am […]
Just before we get into routing in chapter 7, we’re going to review a few more “odds and ends”. In this chapter, we review the basics about the most commonly used transport protocols that ride on IP: TCP & UDP. In addition, we review FTP & SNMP (which I’ll hit in the next post). For […]
While I’m focusing on theory right now so that I can get through the written exam, I’m also thinking about the coming lab. I’m looking forward to the lab prep work, because I love hacking on routers. It’s what I do for a living, and it will be nice to get to the application of […]
HSRP – hot standby routing protocol. Cisco proprietary. Features a virtual IP and MAC 0000.0C07.ACxx (where xx is the group number) that float amongst members of the group, held by the active HSRP router. For redundancy, not inherently load-balancing. VRRP – virtual router redundancy protocol, RFC 3768. Very similar to HSRP, uses groups with virtual […]