`/etc/resolv.conf`의 형식을 어떻게 이해합니까?

형식을 어떻게 이해해야 합니까 /etc/resolv.conf?

$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "systemd-resolve --status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
search fios-router.home

/etc/resolve.conf 맨페이지에는 다음과 같은 내용이 있습니다.

다양한 구성 옵션은 다음과 같습니다.

   nameserver Name server IP address

          Internet address of a name server that the resolver should
          query...

그렇다면 이는 nameserver 127.0.0.53내 로컬 컴퓨터가 IP 주소 127.0.0.53을 사용하여 DNS 서버를 실행하고 있다는 의미입니까? 그 과정을 어떻게 알 수 있나요?

   domain Local domain name.

          Most queries for names within this domain can use short names
          relative to the local domain.  If set to '.', the root domain
          is considered.  If no domain entry is present, the domain is
          determined from the local hostname returned by gethostname(2);
          the domain part is taken to be everything after the first '.'.
          Finally, if the hostname does not contain a domain part, the
          root domain is assumed.

이 부분은 무엇을 의미하나요? 위에서는 어떤 값을 설정할 수 있는지에 대해서만 언급하고 /etc/resolv.conf에서 이 부분의 의미를 설명하지 않습니다. 내 /etc/resolv.conf에 이 부분이 없는 이유는 무엇입니까?

   search Search list for host-name lookup.

          The search list is normally determined from the local domain
          name; by default, it contains only the local domain name.

이 부분은 무엇을 의미하나요? 내 /etc/resolv.conf의 내용은 무엇을 search fios-router.home의미합니까?

감사해요.