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First Check your DNS server<br />
# nslookup google.com<br />
Then ping it.<br />
<br />
# ping google.com<br />
<br />
then run wget to check http access:<br />
#wget <a href="http://www.coogle.com" rel="ugc">http://www.coogle.com</a><br />
<br />
depending the result then you can see where your problem is.
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First Check your DNS server
# nslookup google.com
Then ping it.

# ping google.com

then run wget to check http access:
#wget http://www.coogle.com [http://www.coogle.com]

depending the result then you can see where your problem is.

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What are the relevant commands in UNIX that he could use to verify the connectivity problem cannot access internet?
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What are the relevant commands in UNIX that he could use to verify the connectivity problem cannot access internet?

UNIX command for network trouble shooting

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.

Unix OS

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.