Cisco Certified Network Associate CCNA

Cisco Exams Tutorial Cisco IOS Software Command Line Interface

The subnet mask on the serial interface of a router is expressed in binary as
11111000 for the last octet. How do you express the binary number 11111000 in
decimal?

A. 210
B. 224
C. 240
D. 248
E. 252

Answer: D

Explanation:
128 + 64+32+16+8 = 248. Since this is the last octet of the interface, the subnet mask
would be expressed as a /29.
Reference:
CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN
1-58720-083-X) Page 559

MCSE Certification

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Incorrect Answers:

A. The number 210 would be 11010010 in binary.
B. The number 224 would be 11100000 in binary.
C. The number 240 would be 11110000 in binary
E. The number 252 would be 11111100 in binary. This is known as a /30 and is used
often in point-point links, since there are only 2 available addresses for use in this subnet.