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Technical Interview Questions – Networking

Technical Interview Questions – Networking

  • What is an IP address?
  • What is a subnet mask?
  • What is ARP?
  • What is ARP Cache Poisoning?
  • What is the ANDing process?
  • What is a default gateway? What happens if I don't have one?
  • Can a workstation computer be configured to browse the Internet and yet NOT have a default gateway?
  • What is a subnet?
  • What is APIPA?
  • What is an RFC? Name a few if possible (not necessarily the numbers, just the ideas behind them)
  • What is RFC 1918?
  • What is CIDR?
  • You have the following Network ID: What is the IP range for your network?
  • You have the following Network ID: You need at least 500 hosts per network. How many networks can you create? What subnet mask will you use?
  • You need to view at network traffic. What will you use? Name a few tools
  • How do I know the path that a packet takes to the destination?
  • What does the ping -l 1000 -n 100 command do?
  • What is DHCP? What are the benefits and drawbacks of using it?
  • Describe the steps taken by the client and DHCP server in order to obtain an IP address.
  • What is the DHCPNACK and when do I get one? Name 2 scenarios.
  • What ports are used by DHCP and the DHCP clients?
  • Describe the process of installing a DHCP server in an AD infrastructure.
  • What is DHCPINFORM?
  • Describe the integration between DHCP and DNS.
  • What options in DHCP do you regularly use for an MS network?
  • What are User Classes and Vendor Classes in DHCP?
  • How do I configure a client machine to use a specific User Class?
  • What is the BOOTP protocol used for, where might you find it in Windows network infrastructure?
  • DNS zones – describe the differences between the 4 types.
  • DNS record types – describe the most important ones.
  • Describe the process of working with an external domain name
  • Describe the importance of DNS to AD.
  • Describe a few methods of finding an MX record for a remote domain on the Internet.
  • What does "Disable Recursion" in DNS mean?
  • What could cause the Forwarders and Root Hints to be grayed out?
  • What is a "Single Label domain name" and what sort of issues can it cause?
  • What is the "" zone used for?
  • What are the requirements from DNS to support AD?
  • How do you manually create SRV records in DNS?
  • Name 3 benefits of using AD-integrated zones.
  • What are the benefits of using Windows 2003 DNS when using AD-integrated zones?
  • You installed a new AD domain and the new (and first) DC has not registered its SRV records in DNS. Name a few possible causes.
  • What are the benefits and scenarios of using Stub zones?
  • What are the benefits and scenarios of using Conditional Forwarding?
  • What are the differences between Windows Clustering, Network Load Balancing and Round Robin, and scenarios for each use?
  • How do I work with the Host name cache on a client computer?
  • How do I clear the DNS cache on the DNS server?
  • What is the address used for?
  • What is WINS and when do we use it?
  • Can you have a Microsoft-based network without any WINS server on it? What are the "considerations" regarding not using WINS?
  • Describe the differences between WINS push and pull replications.
  • What is the difference between tombstoning a WINS record and simply deleting it?
  • Name the NetBIOS names you might expect from a Windows 2003 DC that is registered in WINS.
  • Describe the role of the routing table on a host and on a router.
  • What are routing protocols? Why do we need them? Name a few.
  • What are router interfaces? What types can they be?
  • In Windows 2003 routing, what are the interface filters?
  • What is NAT?
  • What is the real difference between NAT and PAT?
  • How do you configure NAT on Windows 2003?
  • How do you allow inbound traffic for specific hosts on Windows 2003 NAT?
  • What is VPN? What types of VPN does Windows 2000 and beyond work with natively?
  • What is IAS? In what scenarios do we use it?
  • What's the difference between Mixed mode and Native mode in AD when dealing with RRAS?
  • What is the "RAS and IAS" group in AD?
  • What are Conditions and Profile in RRAS Policies?
  • What types or authentication can a Windows 2003 based RRAS work with?
  • How does SSL work?
  • How does IPSec work?
  • How do I deploy IPSec for a large number of computers?
  • What types of authentication can IPSec use?
  • What is PFS (Perfect Forward Secrecy) in IPSec?
  • How do I monitor IPSec?
  • Looking at IPSec-encrypted traffic with a sniffer. What packet types do I see?
  • What can you do with NETSH?
  • How do I look at the open ports on my machine?
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