Whaaaats Up

was wondering if someone can help me with this scenrio question i have tryed but am a little confuesed :

A magazine published based in seattle has 2 branch offices: 1 in vancouver, and one in toronto. Each office is internally and sepreratly networked. The networks were implemented years ago, and each has a coaxial linear bus topology supporting ethernet 10 Mbps traffic. The brach offfces stay in touch with each other by telephone and federal express. Recently, the company has begun to develop projects that involve team members from more than 1 office. Each office has resources that the other 2 do not; the current projects require all of these resources. The internal networks have had freqeust cable problems, each time they have a problem, the entire offcie network goes down until the problem is resolved.

The management team would like a network design that offers easier troubleshooting, less down time, and provides WAN communication between sites. They would like the WAN conenction to be able to suppport about 256 Kbps of data andseveral analog telephone conversations betweens sites (thre long distance bills have been un-acceptably high). The combination of long distance and federal-express charges should be eliminated by the WAN. Managment would liek the WAN to be able to continue operating even if one of the WAN links should fail.

a>Identify at least 2 network items in each brach-office network site that neeed up-grading

b>The seperate branch offices need to maintain voice and data communications with each other. Which type of WAN connection (link) might you use to connect the 3 sites to each other?

c> Which type of conenctivity device should be used to conenct the LAN to the multiple paths in the WAN.

These are my answers am i way off:

A>BUS TOPOLOGY,
B>ISDN
C>ROUTER