More test prep!

Some of this stuff seems really self explanatory if you know you what your doing. Unfortunately some of us, like me, don’t. So we have to put time and effort into learning how this stuff works so that in the off chance we are put in charge of a network we don’t make horrendous mistakes that cost people time and money and possibly even your job. I mean, I’m fully aware that someone who only read a Network+ book shouldn’t be solely responsible for an enterprise network. Given time and experience maybe we can get better before we completely ruin a bunch of very serious stuff though. Anyway, or if your in charge of that and aware that you shouldn’t be, sometimes its a good idea to walk away.

I’m back on the VCE questions tonight. Not really sure why but here we go. I mean, I do need to get them done.

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  • SIP – Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, modifying and terminating real-time sessions that involve video, voice, messaging and other communications applications and services between two or more endpoints on IP networks.
  • BGP – BGP offers network stability that guarantees routers can quickly adapt to send packets through another reconnection if one internet path goes down. BGP makes routing decisions based on paths, rules or network policies configured by a network administrator. Each BGP router maintains a standard routing table used to direct packets in transit. This table is used in conjunction with a separate routing table, known as the routing information base (RIB), which is a data table stored on a server on the BGP router. The RIB contains route information both from directly connected external peers, as well as internal peers, and continually updates the routing table as changes occur. BGP is based on TCP/IP and uses client-server topology to communicate routing information, with the client-server initiating a BGP session by sending a request to the server.
  • LACP – Link Aggregation Control Protocol, In computer networking, the term link aggregation applies to various methods of combining multiple network connections in parallel in order to increase throughput beyond what a single connection could sustain, and to provide redundancy in case one of the links should fail
  • LLDP – Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbors on a local area network based on IEEE 802 technology, principally wired Ethernet.

I feel like I should know what SIP is by now, I have no idea what I was thinking. However LACP does seem accurate.

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Of course I called this photo ‘oh rocky’! Anyway, as you see the VCE questions kick it up a notch in difficulty. The middle two don’t make sense to me so lets look at the top and bottom answers.

  • Time division multiplexing – (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern. It is used when the bit rate of the transmission medium exceeds that of the signal to be transmitted. This form of signal multiplexing was developed in telecommunications for telegraphy systems in the late 19th century, but found its most common application in digital telephony in the second half of the 20th century.
  • Time division spread spectrum – spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure communications, increasing resistance to natural interference, noise and jamming, to prevent detection, and to limit power flux density (e.g., in satellite down links).

Ok, then. good to also know about spread spectrum.

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Hummm….requires research lol. This is the closest thing The intrusion prevention system (IPS) compares traffic against signatures of known threats and blocks traffic when a threat is detected. Which, given its true and what the question is talking about,makes sense.

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Since OSI is starting to make sense I’m getting more comfortable with this. Layer 6 makes a hell of a lot of sense after, shocking, reading the book and learning the bits about encryption.

 photo atm cells_zpsr3pfizzn.jpg – In the ISO-OSI reference model data link layer (layer 2), the basic transfer units are generically called frames. In ATM these frames are of a fixed (53 octets or bytes) length and specifically called “cells”.

So I wasn’t clear on what that was but I guess I understand it now. Anyway, Its getting late and I guess that’s all for tonight. I think eventually I’m going to have to get back into the slides but you know, I have to say its very enjoyable to really learn the material. However, I do have a week off at the of the month and that’s what I plan to do with that time.

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