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Network Admin

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  • List the RFC1918 private address space blocks.
  • OSPF is a link state routing protocol. What is meant by the term link state?
  • What is the Spanning Tree protocol used for?
  • What is the function of an Rendezvous Point (RP) in a multicast PIM-Sparse Mode network ?
  • What is control plane policing ?
  • List 7 fields in the IPv4 header and their sizes in bits ?
  • Write an outgoing route-map for a bgp session, advertising all bgp routes, except those containing AS 34245?
  • What do you know about global routing table size increases? What problem is it causing and what are engineer.s doing to try and alleviate the problems it's causing?
  • What do you know about IP address and AS number exhaustion? What current and future methods are you aware of to combat both of these problems?
  • What 5 networking books do you think every network engineer should read ?


  • Can you explain how to work out how many addresses are usable in a standard subnet?
  • If you had to write some code to see if an IP address was in a particular subnet, how would you do it?
  • What is a VLAN? How do they work?
  • Can you explain some differences between, and give examples of when you would use HSRP, VRRP and BGP for resilience?
  • Give an example of when you might use, or have used, tcpdump/ethtool/sniffer ?
  • Updating ACLs safely, how would you go about it?
  • Can you describe the three-way handshake, roughly?
  • What's a link-state protocol?
  • Do you know what an administrative distance is? Any examples?
  • PKI: Can you describe, roughly how Public Key Cyrpto works? If a protocol is encrypted, how can it be proxied?