Role Pack · Junior to Mid
Networking Pack
OSI, TCP/IP, routing, switching, DNS, TLS and the networking interview.
Networking fundamentals to CCNA depth: the stack, addressing, routing and troubleshooting.
- Questions
- 360
- Topics
- 20
- Pages
- 254pages
- 360 questions, every one with a model answer
- OSI/TCP cheat sheet
- Routing & switching
- DNS & TLS
- Troubleshooting drills
Get the Networking Pack — $9
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What is inside
20 chapters, in the order the interviews tend to ask them:
- The OSI model and the TCP/IP model
- Ethernet switching, MAC tables and duplex
- IP addressing, CIDR and subnet planning
- ARP, neighbour tables and IPv6 discovery
- Routing tables and longest prefix match
- Static routes, preference and floating backups
- Dynamic routing and BGP basics
- VLANs, trunks and 802.1Q tagging
- Spanning tree and loop protection
- Inter-VLAN routing and switch virtual interfaces
- OSPF as a link state protocol
- OSPF area design, summarisation and authentication
- NAT, PAT and connection tracking
- DHCP leasing, scopes and options
- DNS resolution, caching and delegation
- TCP, the handshake and flow control
- IPv6 addressing, discovery and transition
- Quality of service, shaping and congestion
- Packet capture and protocol analysis
- Command line troubleshooting and show output
How the answers are built
Each chapter opens with the checklist the question is really testing. A few from this pack:
- Each layer serves the layer above through a defined interface and uses the layer below's service to move data.
- A switch learns by noting the port a source address arrived on, so traffic is learned from the sender's frames.
- A prefix length is the count of leading one bits in the mask, and the remaining bits are host addresses.
- An ARP request is a broadcast asking who owns a target address, and the owner answers with its link layer address.
- Forwarding is longest prefix match: the entry with the most leading one bits decides, and order in the table is irrelevant.
- A static route is a single entry with no protocol behind it, so it is only as correct as the last time you edited it.
Questions this pack covers
- At which OSI layer does an ordinary ethernet switch make its forwarding decision, and what does it read to do it?
- Why does the TCP/IP model combine layers three and four?
- How does a switch learn which port a MAC address sits behind?
- Why does a broadcast frame get flooded across the VLAN?
- Why did classful addressing waste so much address space?
- How do you calculate the usable host count from a prefix length?
- What does an ARP request actually broadcast?
- Why does a failover send a gratuitous ARP when it takes over an address?
Each one is answered in full in the pack, with the reasoning written out rather than a bullet list.
About this pack
- How many questions?
- 360, spread across 20 topics, written out in full across 254 pages.
- Do the answers just list keywords?
- No. Each answer is written as prose, because that is what you have to reproduce when someone asks you the question.
- How do I get it?
- Pay once and the PDF arrives by email immediately, with a signed download link.
- Can I get it refunded?
- Yes, if it is not what you expected. See the refund policy.
