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@TheCyber_Chic

learning in public - technology & security ✧

Lagos, Nigeria 가입일 Mart 2022
67 팔로잉68 팔로워
Marvel
Marvel@TheCyber_Chic·
Packet Tracer Lab 2 - Creating a LAN Built a small network with a router, switch, two PCs, a printer, and an internet server. • PCs configured via DHCP • Printer & server configured statically • Verified connectivity using ping & tracert. #Cybersecurity #CloudSecurity
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Marvel
Marvel@TheCyber_Chic·
Packet Tracer Lab 1 - Observing traffic in a routed network. • Observed traffic in an unrouted LAN • Reconfigured the topology into a routed LAN using an edge router • Requested new IPs via DHCP & verified connectivity. • Then observed traffic flow between the networks.
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Marvel
Marvel@TheCyber_Chic·
Routing tables: Routers store network routes that tell them which interface to use when forwarding packets. Routes can be: • Static (admin config) • Dynamic (from other routers) A default route ensures packets aren’t dropped if the destination network isn’t explicitly listed.
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Marvel
Marvel@TheCyber_Chic·
Key concept: Routing • Routing = identifying the best path to a destination • Routers connect multiple Layer 3 IP networks Switches forward frames using MAC addresses (Layer 2) Routers forward packets using IP addresses (Layer 3).
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Marvel
Marvel@TheCyber_Chic·
Happy Birthday, @ireteeh 🎉 Wishing you a wonderful day and a beautiful year ahead, ma. 🥂
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Marvel
Marvel@TheCyber_Chic·
The ARP process module When a host knows a destination IP but not its MAC: 1. It checks its ARP table 2. If not found → send ARP request broadcast 3. Destination replies with its MAC (ARP reply) 4. Sender stores the mapping & sends the frame #Cybersecurity #CloudSecurity
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Marvel
Marvel@TheCyber_Chic·
I also observed how switches & wireless devices handle frames. • Switch forwards frames based on MAC address • Devices with non-matching MAC discard the frame • Correct destination accepts the packet Wireless networks repackage frames as 802.11, while preserving addressing
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Marvel
Marvel@TheCyber_Chic·
I pinged host 10.10.10.2 from 172.16.31.3 Key observation: • Source IP & Dest. IP stay the same end-to-end • MAC addresses change at router hops Host → Router Src MAC = host Dst MAC = router NIC Router → Destination network Src MAC = router NIC Dest MAC = dest.
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Marvel 리트윗함
Ṣẹ́gunfúnmi😎
Ṣẹ́gunfúnmi😎@segoslavia·
I had a conversation with someone recently about her transitioning into cybersecurity, esp cos she has strong technical background. My advice was: - understand job roles in cybersecurity in your area - search for job vacancies, and do a skill-gap analysis. - highlight your skill gap and draw up a road map to fill up the gap. - start from the beginning, learn the fundamentals. - network and build strong portfolio through projects - Ask questions till you understand! Most people get information overloaded cos they don’t have a clear understanding of where they are coming from and where they are going to!
Mololuwa | Cybersecurity - (The God Complex)@cyber_rekk

When I started in cybersecurity, I did what every beginner does. I tried to learn everything at once. Networking. Linux. Cloud. Hacking tools. Certifications. Months later I realized something frustrating: I still didn't know what interviewers actually expected me to understand. The truth most beginners discover too late? You don't need to know everything. You need to know the right things first. So I created this post to ask you, do you really know what you are doing? How well do you understand - The CIA Triad - Risk Management - Cryptography. Networking - IAM - Incident Response - Cloud Security - Detection Engineering (SIEM/EDR/XDR - Threat Modeling (STRIDE/PASTA) - Attack Surface Mapping - Vulnerability Research & Disclosure Identity Federation (SAML, OIDC, OAuth 2.0) - Role Based Access Control (RBAC) / (ABAC) - Privileged Access Management (PAM) - Multi Factor Authentication (MFA/FIDO2) - Indicators of Compromise (IoC) & Tactics, Techniques, and Procedures (TTPs) - Blast Radius Containment - Post-Mortem Root Cause Analysis (RCA) How well do you think you could defend yourself in an interview?

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Marvel
Marvel@TheCyber_Chic·
Started a Packet Tracer Lab: Identifying MAC & IP addresses. Used simulation mode to inspect ICMP packets moving through the network (NIC-to-NIC communication). Tracked how frames move and reviewed inbound/outbound details at each hop. #Cybersecurity #CloudSecurity
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Marvel
Marvel@TheCyber_Chic·
IP finds the network, MAC finds the specific device within that network. If a destination device is on the same network, the frame is sent directly to that device’s MAC address. If it’s on a different network, the host sends the frame to the default gateway (router) instead.
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Marvel
Marvel@TheCyber_Chic·
MAC vs IP addressing. Devices on a network have two main identifiers: • MAC address → physical address used for NIC-to-NIC communication on the same network. • IP address → logical address used to identify the network and route packets between networks.
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Marvel
Marvel@TheCyber_Chic·
I also explored NAT: Private IPs can’t route on the internet, so routers translate them into public addresses using a NAT table. Observed this in Packet Tracer simulation - watching packets change from private → public → private again. #Cybersecurity #CloudSecurity
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Marvel
Marvel@TheCyber_Chic·
Started Module 12: Gateways to Other Networks. Key idea: hosts determine whether a destination is local using subnet masks and binary ANDing. If the destination isn’t on the local network → traffic is sent to the default gateway (router).
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Marvel
Marvel@TheCyber_Chic·
Packet Tracer Lab: DHCP Configuration • Built a small topology (router + 3 PCs) • Requested dynamic IP via DHCP • Accessed router GUI to modify DHCP range & router IP • Renewed IPs & verified connectivity It was good practice for understanding how DHCP assigns addresses
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