Chapter 1
Cloud Architecture
Course: Comptia Cloud Cv0 004
Subject: Comptia Cloud Cv0004
Chapter: Troubleshooting
1. Network Service Unavailability
Network service unavailability refers to critical foundational network services becoming unreachable or failing outright, leading to widespread connectivity failures or degraded application performance. These services—such as DHCP, DNS, NTP, NAT, and HTTP—are essential for dynamic IP addressing, name resolution, time synchronization, address translation, and web communication, respectively.
a. Dynamic Host Configuration Protocol (DHCP)
Issue: DHCP servers fail to assign IP addresses or renew leases for network clients.
Technical Details:
- DHCP manages automatic IP addressing by leasing IP addresses from a defined pool or scope.
- Scope exhaustion occurs when all available IP addresses in the DHCP pool are allocated, preventing new devices from receiving valid IPs.
- Relay agents are often used to forward DHCP requests across subnets, and misconfigurations here can disrupt IP allocation.
Symptoms: