CCDA 640-864 Summary Notes – Chapter 6 – Day 14

Exam Topic 3: WAN Design Methodology Use PPDIOO Methodology. Key concepts: Analyze the network requirements Application type Traffic volume Traffic patterns Characterize existing network Design topology chould be flexible and have room for growth Implement High Availability. Consider: Response time Throughput Reliability Application requirements Data File transfer Reasonable response time (time between the cient user request … Continue reading CCDA 640-864 Summary Notes – Chapter 6 – Day 14 →

CCNA Voice Summary – Part 11

Quality of Service Disadvantages of packet switched networks can be solved using QoS. ITU recommendations (G.114 specifications): Delay < or = 150 ms one way Jitter < or = 30 ms Packet loss < or = 1% Bandwidth for Voice and Video RTP is subject to codec, sampling, L2 and L3 overhead. Bandwidth for signaling … Continue reading CCNA Voice Summary – Part 11 →

CCNA Voice Summary – Part 4

Circuit Switched Network Involves 2 nodes that establish a dedicated circuit in order to communicate. The channel remains up during the whole conversation. PSTN is the largest Circuit switched network in the world. The PSTN uses SS7 signaling. Advantages: Dedicated Channel; Excellent quality; delay and bit rate is constant Disadvantages: Not always enough available channels; … Continue reading CCNA Voice Summary – Part 4 →