Network Admin

Network Admin

Back to Interview Questions

Magnet

• 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 ?

HEAnet

• 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?