About Me
Cisco Certified Architect (CCAr)
1 **Foundation**
1-1 **Networking Fundamentals**
1-1 1 OSI and TCPIP Models
1-1 2 Network Devices and Their Functions
1-1 3 IP Addressing and Subnetting
1-1 4 Routing and Switching Basics
1-1 5 Network Security Fundamentals
1-2 **Enterprise Architecture**
1-2 1 Enterprise Network Design Principles
1-2 2 Network Segmentation and Zoning
1-2 3 Network Services and Protocols
1-2 4 Network Management and Monitoring
1-2 5 Network Automation and Programmability
2 **Design**
2-1 **Network Design Methodologies**
2-1 1 Design Life Cycle
2-1 2 Requirements Gathering and Analysis
2-1 3 Design Documentation and Validation
2-1 4 Design Implementation and Testing
2-1 5 Design Maintenance and Optimization
2-2 **Enterprise Network Design**
2-2 1 Campus Network Design
2-2 2 Data Center Network Design
2-2 3 WAN Design
2-2 4 Wireless Network Design
2-2 5 Security Architecture Design
3 **Implementation**
3-1 **Network Implementation Planning**
3-1 1 Implementation Strategies
3-1 2 Resource Allocation and Scheduling
3-1 3 Risk Management and Mitigation
3-1 4 Change Management
3-1 5 Post-Implementation Review
3-2 **Network Services Implementation**
3-2 1 IP Address Management (IPAM)
3-2 2 DNS and DHCP Implementation
3-2 3 Network Access Control (NAC)
3-2 4 VPN and Remote Access Implementation
3-2 5 Network Security Services Implementation
4 **Operation**
4-1 **Network Operations Management**
4-1 1 Network Monitoring and Performance Management
4-1 2 Fault Management and Troubleshooting
4-1 3 Capacity Planning and Management
4-1 4 Network Change and Configuration Management
4-1 5 Network Compliance and Auditing
4-2 **Network Security Operations**
4-2 1 Incident Response and Management
4-2 2 Threat Detection and Mitigation
4-2 3 Security Information and Event Management (SIEM)
4-2 4 Vulnerability Management
4-2 5 Security Policy Enforcement and Monitoring
5 **Optimization**
5-1 **Network Optimization Techniques**
5-1 1 Traffic Engineering and Load Balancing
5-1 2 Quality of Service (QoS) Implementation
5-1 3 Network Performance Tuning
5-1 4 Energy Efficiency and Green Networking
5-1 5 Network Optimization Tools and Technologies
5-2 **Network Automation and Orchestration**
5-2 1 Network Programmability and Automation
5-2 2 Software-Defined Networking (SDN)
5-2 3 Network Function Virtualization (NFV)
5-2 4 Automation Tools and Frameworks
5-2 5 Continuous Integration and Continuous Deployment (CICD) for Networks
6 **Leadership**
6-1 **Leadership and Management Skills**
6-1 1 Strategic Planning and Vision
6-1 2 Team Leadership and Development
6-1 3 Communication and Stakeholder Management
6-1 4 Financial Management and Budgeting
6-1 5 Project Management and Execution
6-2 **Professional Ethics and Standards**
6-2 1 Ethical Decision-Making
6-2 2 Industry Standards and Compliance
6-2 3 Intellectual Property and Licensing
6-2 4 Professional Development and Continuous Learning
6-2 5 Global and Cultural Awareness
5.1.2 Quality of Service (QoS) Implementation Explained

5.1.2 Quality of Service (QoS) Implementation Explained

Key Concepts

Quality of Service (QoS) Implementation involves configuring network devices to prioritize and manage traffic to ensure optimal performance for critical applications. Key concepts include:

Classification and Marking

Classification and Marking involve identifying and categorizing network traffic based on specific criteria such as source IP, destination IP, protocol, or application type. Once classified, packets are marked with a priority level using Differentiated Services Code Point (DSCP) or IEEE 802.1p values. This marking helps in prioritizing traffic during transmission.

An analogy for Classification and Marking is sorting mail. Just as mail is sorted by type (letters, packages, etc.) and marked with priority (express, standard), network traffic is sorted and marked with priority levels.

Congestion Management

Congestion Management involves using queuing techniques to manage network traffic during periods of congestion. Common queuing methods include First In, First Out (FIFO), Priority Queuing, Weighted Fair Queuing (WFQ), and Custom Queuing. These methods ensure that critical traffic is given priority and that no single type of traffic monopolizes the network.

Think of Congestion Management as traffic lights. Just as traffic lights manage the flow of vehicles to prevent congestion, queuing methods manage the flow of data to prevent network congestion.

Congestion Avoidance

Congestion Avoidance involves using techniques to prevent network congestion before it occurs. This includes Random Early Detection (RED) and Weighted RED (WRED). RED drops packets randomly when the queue reaches a certain threshold, while WRED drops packets based on their priority. This helps in smoothing out traffic flow and preventing congestion.

An analogy for Congestion Avoidance is a traffic management system. Just as a traffic management system uses sensors and signals to prevent congestion, RED and WRED use thresholds and priorities to prevent network congestion.

Policing and Shaping

Policing and Shaping involve controlling the rate at which traffic is transmitted. Policing drops or re-marks packets that exceed a specified rate, while Shaping buffers excess packets and transmits them at a controlled rate. This ensures that traffic does not exceed the network's capacity and maintains consistent performance.

Think of Policing and Shaping as traffic enforcement. Just as traffic enforcement controls the speed of vehicles, policing and shaping control the rate of data transmission to ensure smooth network operation.

Link Efficiency Mechanisms

Link Efficiency Mechanisms involve using techniques to maximize the efficiency of network links. This includes Link Fragmentation and Interleaving (LFI), which breaks large packets into smaller fragments and interleaves them with other traffic to improve throughput. Another technique is Generic Segmentation Offload (GSO), which reduces CPU overhead by handling packet segmentation at the network interface card (NIC).

An analogy for Link Efficiency Mechanisms is a conveyor belt. Just as a conveyor belt efficiently moves items by breaking them into smaller parts and interleaving them, LFI and GSO efficiently move data by breaking packets into smaller fragments and interleaving them with other traffic.

Understanding and effectively implementing Quality of Service (QoS) is crucial for ensuring optimal network performance and prioritizing critical applications. By mastering these concepts, network architects can create robust and efficient network solutions.

© 2024 Ahmed Baheeg Khorshid. All rights reserved.