A.--from=

B.--upto=

C.--until=

D.--date=

E.--since=

A.2001:db8::15 www.example.com www

B.2003.0.113.15,2001:db8::15 www.example.com www

C.www.example.com,www 203.0.13.15,2001:db8::15

D.203.0.113.15 www.example.com www

E.www.example.com www 203.0.13.15

A.By a fixed UUID that is defined in the X11 configuration file.

B.By a display name like: 1.

C.By the name of the user that runs the X server like x11:bob.

D.By a device name like /dev/X11/xservers/1.

E.By a unique IPv6 address from the fe80::/64subnet.

A.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.

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

C.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.

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