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Cisco 200-301 Practice Test 8

Question 70

Two adjacent networks, 10.4.0.0/26 and 10.4.0.64/26, must be summarized exactly. Which supernet covers only those two?

  1. 10.4.0.0/25
  2. 10.4.0.0/26
  3. 10.4.0.64/25
  4. 10.4.0.0/24

Explanation

Correct Answer

A:

Each /26 has 64 addresses; aligned adjacent .0 and .64 blocks combine to .0/25.

Incorrect Answers

B:

This includes only the first of the two /26 blocks.

C:

The .64 start is not a valid /25 boundary.

D:

A /24 also includes .128–.255, outside the two networks.

Question 71

Two devices use 10.0.9.31/27 and 10.0.9.32/27 with no router. Can they communicate as same-subnet peers?

  1. Yes; .31 and .32 are consecutive addresses
  2. No; the addresses lie on different /27 blocks
  3. No; 10.0.9.32 is a public IPv4 address
  4. Yes; both are within 10.0.9.0/24

Explanation

Correct Answer

B:

/27 ranges are .0–.31 and .32–.63; the two addresses are separated by a boundary, and .31 is broadcast.

Incorrect Answers

A:

Adjacent numeric addresses can belong to separate IP subnets.

C:

The 10/8 block is private; the issue is the subnet boundary and invalid network/broadcast roles.

D:

Their shared /24 is irrelevant because each device uses a /27 mask.

Question 72

A subnet 172.16.0.0/20 is assigned to a server VLAN. Which last-octet/third-octet boundary correctly describes its address range?

  1. 172.16.0.0 through 172.16.7.255
  2. 172.16.0.0 through 172.16.31.255
  3. 172.16.0.0 through 172.16.16.255
  4. 172.16.0.0 through 172.16.15.255

Explanation

Correct Answer

D:

A /20 covers 16 consecutive third-octet values, 0 through 15 here.

Incorrect Answers

A:

Only eight third-octet blocks are covered, equivalent to /21.

B:

That spans a /19, twice the intended /20.

C:

The 16.x addresses belong to the following /20 block.

Question 73

A routing engineer sees an advertised IPv4 prefix 192.168.20.0/23. Which two /24 networks are contained in that prefix?

  1. 192.168.21.0/24 and 192.168.22.0/24
  2. 192.168.20.0/24 and 192.168.21.0/24
  3. 192.168.19.0/24 and 192.168.20.0/24
  4. 192.168.20.0/24 and 192.168.22.0/24

Explanation

Correct Answer

B:

A /23 masks the last bit of the third octet; an even .20 start covers .20 and .21.

Incorrect Answers

A:

The .22/24 lies in the following /23, not 192.168.20.0/23.

C:

The /23 boundary must begin at an even third octet; .19 belongs to the previous block.

D:

The two halves must be consecutive; the second is .21.

Question 74

A network administrator subdivides one IPv4 /24 into equally sized /28 subnets. How many distinct /28 networks result?

  1. 16
  2. 32
  3. 8
  4. 14

Explanation

Correct Answer

A:

Borrowing four subnet bits (28−24) creates 2^4 = 16 equal subnets.

Incorrect Answers

B:

Thirty-two results from borrowing five subnet bits, as with /29.

C:

Eight results from borrowing three subnet bits, as with /27.

D:

This incorrectly subtracts two host-reserved addresses from the number of subnets.

Question 75

A provider allocates one /27 and divides it into conventional /30 point-to-point subnets. How many /30 networks fit?

  1. 16
  2. 6
  3. 8
  4. 4

Explanation

Correct Answer

C:

Moving from /27 to /30 adds three subnet bits, giving 2^3 = 8.

Incorrect Answers

A:

Sixteen would require four additional subnet bits, not three.

B:

This confuses usable host counts with the count of child subnets.

D:

Four would be the number of /29 blocks inside /27.

Question 76

An address plan assigns 10.5.24.0/21 to a branch. Which third-octet span is inside that one network?

  1. 25 through 32
  2. 24 through 31
  3. 24 through 27
  4. 24 through 39

Explanation

Correct Answer

B:

A /21 has a block size of eight in the third octet; .24 is an aligned boundary.

Incorrect Answers

A:

The network starts with third octet 24 and ends before 32.

C:

That is a /22-sized four-block range.

D:

That spans 16 blocks, a /20-sized range.

Question 77

Routes 10.2.4.0/24 and 10.2.5.0/24 are adjacent and equally managed. Which summary exactly covers both?

  1. 10.2.5.0/23
  2. 10.2.4.0/22
  3. 10.2.4.0/23
  4. 10.2.4.0/24

Explanation

Correct Answer

C:

An even .4 third-octet boundary allows .4 and .5 to aggregate into /23.

Incorrect Answers

A:

A /23 must start at an even third-octet value; .5 is misaligned.

B:

A /22 includes .4–.7, adding two unrequested /24s.

D:

Only the first /24 is covered.

Question 78

An IPAM review proposes 10.1.16.0/23 for one team and 10.1.17.0/24 for another. What is the correct overlap finding?

  1. They overlap only at their broadcast addresses
  2. They overlap: the /23 includes all of 10.1.17.0/24
  3. Only address 10.1.17.0 overlaps
  4. They are disjoint because their third octets differ

Explanation

Correct Answer

B:

10.1.16.0/23 spans 10.1.16.0–10.1.17.255.

Incorrect Answers

A:

The overlap covers the entire /24, not only a reserved endpoint.

C:

Every address in the second /24 is contained in the first /23.

D:

A /23 spans two adjacent /24s, so differing third octets can still overlap.

Question 79

A host is 192.168.50.129/26 but its gateway is configured as 192.168.50.1. Which replacement gateway is on its connected subnet?

  1. 192.168.50.64
  2. 192.168.50.1
  3. 192.168.50.130
  4. 192.168.50.192

Explanation

Correct Answer

C:

A /26 containing .129 has network .128 and usable range .129–.190.

Incorrect Answers

A:

This address identifies the second /26 and is not on the .128/26 LAN.

B:

This gateway belongs to the first /26, not the host’s fourth /26.

D:

This is the network identifier of the next /26.

Question 80

An IOS standard ACL should match exactly one source IP, 10.10.10.50, rather than a subnet. Which wildcard value is correct?

  1. 0.0.0.255
  2. 0.0.0.0
  3. 255.255.255.255
  4. 0.0.0.1

Explanation

Correct Answer

B:

All wildcard bits zero require every source-address bit to match.

Incorrect Answers

A:

That matches all addresses in 10.10.10.0/24 with the corresponding base.

C:

That wildcard ignores all 32 address bits instead of matching one host.

D:

That allows variation in one address bit, matching two addresses.

Cisco Certified Network Associate (CCNA) (200-301) Practice Tests

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