37899700
Description
Flashcards by Rick Schoenman, updated more than 1 year ago
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Created by Rick Schoenman
about 2 years ago
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| Question | Answer |
| Describe the DHCP failover implementation | This implementation allows 2 DHCP servers to actively work together. Lease information is replicated between the DHCP servers. If one of the DHCP servers fails, the other one takes over the entire scope. |
| How many DHCP servers can be part of a failover relationship? | 2 |
| Can a DHCP server have multiple failover relationships? | Yes, but each relationship can only exist of 2 DHCP servers. |
| Is DHCP failover time sensitive? | Yes, if the time difference is greater then 1 minute, the failover process halts with an error |
| In which 2 modes can DHCP failover be configured? | - Load Balance - Hot standby |
| Describe DHCP failover - load balance mode | This is the default mode. Both DHCP servers supply IP configuration to clients simultaneously. It makes use of a load balance ratio, which by default is 50:50 |
| Describe DHCP failover - hot standy mode | In this mode, one DHCP server is the primary server and the other the secondary. If the primary DHCP server stops working, the secondary takes over. |
| Consider using DHCP failover - hot standy mode. When the primary DHCP server goes down, it takes some time before the secondary DHCP server takes control of the address range. How is this period of time called? | Maximum Client Lead Time (MCLT) |
| When configuring DHCP failover - hot standby mode, a percentage of the addresses must be reserved for the standby server. What are these addresses used for? | These addresses will be assigned by the standby DHCP server during the Maximum Client Lead Time (MCLT), |
| What happens when DHCP servers in a DHCP failover implementation, loose communication with each other? | The DHCP servers automatically enter a communication interrupted state. |
| Consider DHCP servers in a DHCP failover implementation. What do you do when DHCP servers are in a communication interrupted state? | You have to manually switch the DHCP servers to a 'partner down' state. |
| Consider DHCP servers in a DHCP failover implementation. What is the 'auto state switchover interval'? | When DHCP servers are in a communication interrupted state, you normally have to manually set them to a 'partner down' state. The 'auto state switchover interval' can be set to do this automatically after a period of time. |
| Consider DHCP servers in a DHCP failover implementation. Where is the 'shared secret' being used for? | This is used to authenticate failover message traffic between the replication partners. |
| Which firewall port is used by DHCP servers in a DHCP failover implementation for failover traffic? | TCP 647 |
| Which 2 firewall rules are created during DHCP installation? | Microsoft-Windows-DHCP-Failover-TCP-In Microsoft-Windows-DHCP-Failover-TCP-Out |
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