Computer Networking
ICMP (Internet Control Message Protocol) is

a protocol used to monitor computers
a TCP/IP high level protocol for transferring files from one machine to another
a protocol that handles error and control messages
None of these
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address

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Computer Networking
When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?

Only extended VLAN's are allowed by default.
No VLAN's are allowed, you must configure each VLAN by hand.
By default, all VLANs are allowed on the trunk.
Only configured VLAN's are allowed on the link.

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