Quick Revision

## ✅ **Networking + Protocols Quick Recap**


| Topic        | Key Concept / Tool | Details / Examples |

|--------------|--------------------|---------------------|

| **VLAN**     | Native VLAN        | Untagged traffic on trunk (default VLAN 1) |

|              | Inter-VLAN Routing | Requires router-on-a-stick or Layer 3 switch |

|              | Troubleshooting    | `show vlan brief`, `show interfaces trunk` |

| **OSPF**     | LSA Types          | Type 1–7 (internal, summary, external, NSSA) |

|              | States             | Down, Init, 2-Way, ExStart, Exchange, Loading, Full |

|              | DR/BDR             | Only in broadcast/NBMA, not in P2P |

|              | Area Types         | Stub, Totally Stubby, NSSA, Totally NSSA |

|              | Key Commands       | `show ip ospf neighbor`, `show ip ospf database` |

| **RIP**      | Max Hop Count      | 15 (16 = unreachable) |

|              | Loop Prevention    | Split Horizon, Poison Reverse, Hold Down |

|              | RIP v1 vs v2       | v1 = classful, v2 = classless + authentication |

| **STP**      | States             | Blocking, Listening, Learning, Forwarding |

|              | Loop Prevention    | STP blocks redundant links |

|              | Tools              | BPDU Guard (blocks rogue switches), Root Guard |

|              | Root Bridge        | Lowest Bridge ID (priority + MAC) wins |

| **IPv4**     | Subnetting         | /27 = 30 usable IPs, /26 for 1024 subnets from /16 |

|              | ARP / RARP         | ARP = IP → MAC, RARP = MAC → IP (obsolete) |

|              | IP Conflict        | Use `show ip arp`, `show mac address-table` |

| **DHCP**     | DORA Process       | Discover, Offer, Request, Acknowledge |

|              | IP Helper Address  | Used to forward DHCP requests across subnets |

|              | DHCP Snooping      | Secures against rogue DHCP, blocks spoofed replies |

|              | Conflict Handling  | Detect with `show ip dhcp binding`, resolve via port tracing |

| **IPv6**     | Address Types      | Unicast, Anycast, Multicast |

|              | Link-local         | Mandatory for ND, always starts with `fe80::` |

|              | No Broadcast       | Uses Multicast instead (`ff02::1`, `ff02::2`) |


---


## ✅ **Managerial Round: Tailored Behavioral Answers**


| Question                                     | Key Takeaway |

|---------------------------------------------|--------------|

| Challenging project                          | Infinera, CommScope – automation gains |

| Prioritizing tasks under deadline            | Risk-based approach, parallelism, stakeholder sync |

| Conflict handling                            | Empathy + direct conversation + focus on resolution |

| Quality under pressure                       | Prioritization, automation, communication |

| Leadership style                             | Collaborative, mentoring, upskilling juniors |

| Handling underperformance                    | Private feedback + plan + mentoring |

| Cross-functional collaboration               | Dev + QA + Ops – bridge via documentation & automation |

| Customer escalations                         | EPON issues, used Wireshark to resolve bugs |

| Estimation planning                          | Break into phases, Jira for tracking, add buffer |

| Process improvement                          | Python wrappers saved hours/sprint |


---


## ✅ **HR Round: Tailored Responses**


| Question                            | Custom Answer |

|-------------------------------------|---------------|

| Tell me about yourself              | Sr. Test Eng, 12+ yrs, Python+Networking |

| Why do you want to leave?           | Seeking growth, strategy-level ownership |

| Strengths/Weaknesses                | Strength = collaboration; Weakness = perfectionism (improving) |

| Where do you see yourself?          | QA lead/architect, influencing test strategy |

| Work-life balance                   | Planned blocks, time for baby, family & career |

| Why hire you                        | Deep automation + strong leadership + growth mindset |

| Salary expectation                  | Based on role, current CTC, industry standards |

| Relocation/shift comfort            | Prefer Bangalore, open to hybrid/occasional stretch |

| Hobbies                             | Family time, creative content on motherhood & tech |


---


## 📦 **Quick Commands to Remember (Cisco Style)**


| Purpose                     | Command |

|-----------------------------|---------|

| Show VLAN info              | `show vlan brief` |

| Check trunks                | `show interfaces trunk` |

| View OSPF neighbors         | `show ip ospf neighbor` |

| Check routing table         | `show ip route` |

| DHCP leases                 | `show ip dhcp binding` |

| Enable DHCP relay           | `ip helper-address [IP]` |

| Enable DHCP snooping        | `ip dhcp snooping`, `ip dhcp snooping vlan X` |

| Enable STP root             | `spanning-tree vlan X priority 4096` |

| Check spanning-tree roles   | `show spanning-tree` |

| View ARP table              | `show ip arp` |

| MAC address tracking        | `show mac address-table | include [MAC]` |


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