Same Header & Footer for Main site & Sub-Domain is against to SEO Guidelines?

[chinnabotla]

I have a client site for Ex - site.com. Its blog site is blog.site.com

Main website site.com's menu bar is having 50 links, the same menu section with 50 links we have placed in the footer. Which means 50 links in the header and 50 links in the footer.

The same header (50 links) & footer (50 links) we are using for blog.site.com

Below are my queries.
1. Keeping the header (50 links) and footer (50 links) the same on the website will hurt SEO?
2. Shall I need to add nofollow tag for footer links (50 links)?
3. Using main domain.com links in the header (50 links) and footer (50 links) of blog.domain.com is that spamming?

Please help with the answers

[nick0201]

1.
first, answer what is the purpose of placing the same 50 links in both header and footer?
Does it make any sense? you can sort from those 50 URLs and add some of them in the footer.

2. 50 Footer links are not advisable so keep number less. No need to make it no-follow.

3. using the same menu n footer where you focus is a blog. what is the meaning of displaying 50 other URLs.
It will look unnatural. So avoid it if you can.

[nick0201]

Still waiting for your response!!