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: 192.115.103.64/27. What is the IP range for your network?
• You have the following Network ID: 131.112.0.0. 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 192.168.0.1 -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 "in-addr.arpa" 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 224.0.1.24 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?

The next article in this series will cover Active Directory questions!