200-301 · Question #747
Which command can you enter on a Cisco IOS device to enable a scheduled algorithm that directs lookup calls to multiple DNS hosts?
The correct answer is B. ip name-server 192.168.10.14 192.168.10.15. The ip name-server command on a Cisco IOS device is used to specify DNS server IP addresses, and when multiple servers are listed, the device employs a round-robin algorithm for lookups.
Question
Which command can you enter on a Cisco IOS device to enable a scheduled algorithm that directs lookup calls to multiple DNS hosts?
Options
- Aip domain round-robin
- Bip name-server 192.168.10.14 192.168.10.15
- Cip domain lookup
- Dip domain list
How the community answered
(51 responses)- A2% (1)
- B88% (45)
- C8% (4)
- D2% (1)
Why each option
The `ip name-server` command on a Cisco IOS device is used to specify DNS server IP addresses, and when multiple servers are listed, the device employs a round-robin algorithm for lookups.
The `ip domain round-robin` command is not a valid or standard Cisco IOS command for configuring DNS server lookup behavior.
The `ip name-server` command configures the IP addresses of DNS servers used by the Cisco IOS device for hostname resolution. By listing multiple DNS server IP addresses with this command, the device automatically implements a round-robin scheduling algorithm to distribute DNS lookup requests, ensuring redundancy and load balancing among the configured servers.
The `ip domain lookup` command only enables DNS lookup globally but does not specify DNS server addresses or their selection algorithm.
The `ip domain list` command defines domain names to append to unqualified hostnames during DNS lookups, not the DNS servers or their lookup method.
Concept tested: Cisco IOS DNS server configuration
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipaddr/command/reference/iap_book/iap_i1.html#wp1035071
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