CCNA 200-301 And Network+ N10-007 Practice Exam: Network Mask Numbers

Today’s CCNA 200-301 Bulldog Practice Exam focuses on network masks, address classes, and other network address fundamentals.  When you have these fundamentals down, you’re well on your way to subnetting success — not to mention earning your CCNA!  Let’s jump right in…and when you’re done here, take the other free CCNA Practice Exams posted on my site.

Question 1:

What’s the network mask for a Class B network?

A.   255.0.0.0

B.   255.255.0.0

C.   255.255.255.0

D.   255.240.0.0

Question 2:

How many host bits are in the Class C network mask?

A.  0

B.  24

C.  16

D.  8

E.   20

Question 3:

What’s the range of acceptable first octets for a Class A network?

A.   1 – 127

B.   1 – 126

C.   128 – 191

D.   192-223

E.   192 – 221

Question 4:

The phrase “experimental addresses” is sometimes used to describe which particular address class?

A.   Class D

B.   Class E

C.   Class X

D.   Class A

E.   Class B

Question 5:

Which of these ranges is the RFC 1918 private address range for Class B addressing?

A.   172.16.0.0 – 172.63.255.255

B.   172.16.0.1 – 172.63.255.255

C.   192.168.0.0 – 192.168.255.255

D.   192.168.0.1 – 192.168.255.255

E.   172.16.0.0 – 172.31.255.255

F.    172.16.0.1  – 172.31.255.255

And now…. the answers!

Answer 1:  B.  The network mask for Class B addresses is 255.255.0.0.

Answer 2:  D.   There are 8 host bits in the Class C network mask (255.255.255.0).

Answer 3:   B.   The Class A network mask first-octet range is 1 – 126.   Bonus tip:  The Class B range starts with 128 and ends with 191.  If an address has a first octet of 127, that address is in the reserved range for loopback addressing.

Answer 4:   B.  You’ll sometimes see Class E addresses described as “experimental”.  The first-octet range is 240-255.

Answer 5:  E.   The RFC 1918 Class B private address range is 172.16.0.0 – 172.31.255.255.  Using prefix notation, that range is expressed as 172.16.0.0 /12.

More CCNA Practice Exams and Network+ Practice exams await you.  I’ll see you here tomorrow with another new exam, as well as on my Twitter and YouTube channels!