your multi-national network is under a single control (your company); while the internet backbone has no single control (hence BGP comes in, etc). your network is more or less like a telco's ENTERPRISE network such as AT&T's (Allstream), Bell's, MCI's and Sprint's.
Note: the above Telcos have their own PUBLIC internet networks too, but those are NOT their enterprise networks -- Hint: the typical example of an Enterprise network is the ATM networks for banking machines.
so when you talk about 主干网, you have to distinguish between different kinds of networks.
for most small-to-medium ISPs, NOC is the ultimate level of support. for a big ISP such as UUNET, NOC was both level-1 and level-2 (we didn't need a redundant layer of helpdesk), and Engineering and Architecture was the level-3 support (I was a fresh hand and didn't qualify for that group ;)).
Implementation is never in the loop of support/operation for any organizations.
indeed that was a very valuable experience to you.
Note: the above Telcos have their own PUBLIC internet networks too, but those are NOT their enterprise networks -- Hint: the typical example of an Enterprise network is the ATM networks for banking machines.
so when you talk about 主干网, you have to distinguish between different kinds of networks.
for most small-to-medium ISPs, NOC is the ultimate level of support. for a big ISP such as UUNET, NOC was both level-1 and level-2 (we didn't need a redundant layer of helpdesk), and Engineering and Architecture was the level-3 support (I was a fresh hand and didn't qualify for that group ;)).
Implementation is never in the loop of support/operation for any organizations.
indeed that was a very valuable experience to you.