A network technician is troubleshooting an issue where certain external web resources become intermittently unreachable from within the company's network. Upon further investigation, the technician suspects that this may be due to improperly configured DNS records. Which specific DNS record field should the technician examine to ensure that outdated DNS information is not being cached excessively, leading to potential resolution errors?
Start of authority (SOA)
Time to live (TTL)
Mail exchange (MX)
Canonical name (CNAME)