Newly Released LPI 102-500 Exam PDF

route del default

ifconfig unset default

netstat -r default

ip route del default

sysctl ipv4.default_gw=0

The local routing information may be corrupted and must be re-validated using a routing protocol.

One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.

There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.

DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

It is a plain text file containing a string such as Europe/Berlin

It is created and maintained by the NTP service based on the location of the system’s IP address.

It is a symlink to /sys/device/clock/ltime and always contains the current local time.

After changing this file, newtzconfig has to be run to make the changes effective.

It is either a symlink to or a copy of a timezone information file such as /usr/share/zoneinfo/Europe/Berlin.

In the database file /etc/crontab.db which is shared by all users.

As individual per-user files within /var/spool/cron.

As individual per-user files in /etc/cron.user.d.

In the .crontab file in the user's home directory.

In the file /var/cron/user-crontab which is shared by all users.