You are a system administrator and you want to deny access to a
group of computers with addresses 172.30.16.0 to
172.30.31.0. Which
wildcard mask would you use?
A. 0.0.15.255
B. 0.0.255.255
C. 0.0.31.255
D. 0.0.127.255
E. 0.0.255.255
- 1 Answers
- 10307 Views
- I also Faced
- E-Mail Answers
Answer Posted / guest
Answer:: A
0.0.15.255 will check the last 13 bits of an address so that
computers
172.30.16.0 to 172.30.31.0 will be denied access. 0.0.31.255
would check
the last 6 binary digits and deny access to addresses
172.30.32.0 to
172.30.63.0. 0.0.127.255 would check the last 7 binary
digits and deny
access to addresses 172.30.64.0 to 172.30.127.0. 0.0.255.255
would deny
172.30.0.0 to 172.30.254.0. If you write decimal 15 in
binary, you have
0001111, the 1's tell the router to ignore address with
these bits set;
0's tell the router to check the bits. The third octet for
172.30.16.0
is 00010000. The third octet for 172.30.31.0 would be
00011111. So,
traffic from these addresses would be denied.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
Mention what does the clock rate do?
How many parts of ping?
Which protocol works only on cisco routers?
Which company mange api's?
In port based access-list which command u give instead of ip?
Which dynamic type draw back is, if single link down, it removes its routing table?
Which protocols are link states?
Explain how many types of ends in wan?
After how long keep alive messages exchange in eigrp?
Explain the term 'broadcast'.
State the difference between dynamic IP and static IP addressing?
In stead of 0.0.0.0 wild card mask what you can write after ip?
Tell me when we use standard access-list?
Which protocol you manually enable route summarization?
In which protocol supenetting is enable by default?
