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Cisco 200-301 Practice Test 67

Question 660

An ACL appears to block a legitimate application. The operator wants its entries and match counters without altering packet policy. Which ACL display command supplies that information?

  1. Run show ip route and infer which ACL line denied the session
  2. Use show access-lists or the ACL display
  3. Run show logging only and assume every ACL rule count is logged
  4. Run show interfaces status and infer packet-denial line numbers

Explanation

Correct Answer

B:

ACL hit counters can show which statements matched traffic.

Incorrect Answers

A:

A routing table reports installed prefixes, not ACL entries and per-line match counters.

C:

Logging output may omit unlogged matches and does not replace per-rule ACL counters.

D:

Link state cannot enumerate ACL rules or their match counters.

Question 661

An IPv4 ACL named EDGE_IN is already defined. On routed interface Gi0/1, the policy must evaluate packets as they **enter** Gi0/1 from the attached network, before outbound routing toward other interfaces. Which interface-level attachment applies that direction?

  1. ip access-group EDGE_IN out
  2. ip access-list extended EDGE_IN
  3. ip access-group EDGE_IN in under interface Gi0/1
  4. ip access-group EDGE_IN in under the unrelated Gi0/0 interface

Explanation

Correct Answer

C:

The ip access-group EDGE_IN in command under Gi0/1 filters packets arriving at that interface before the applicable forwarding decision, not packets leaving it.

Incorrect Answers

A:

Outbound direction filters packets leaving Gi0/1, not packets arriving on Gi0/1 as specified.

B:

This creates or edits the ACL’s ACEs but does not attach it to a particular interface or choose inbound processing.

D:

The inbound direction would be correct but on the wrong link; the policy explicitly attaches to Gi0/1.

Question 662

An ACL named EDGE_OUT is already configured. The security design requires filtering packets only as they **exit** router interface Gi0/1 toward its attached subnet. Which application command and direction meet the requirement?

  1. ip access-group EDGE_OUT in on interface Gi0/1
  2. ip access-group EDGE_OUT out under interface Gi0/1
  3. ip access-list extended EDGE_OUT without interface attachment
  4. ip access-group EDGE_OUT out on Gi0/0 instead

Explanation

Correct Answer

B:

The ip access-group EDGE_OUT out command under Gi0/1 attaches the existing named ACL to packets leaving that interface, rather than arriving on it.

Incorrect Answers

A:

Inbound processing evaluates packets received at Gi0/1, the opposite traffic direction from packets leaving Gi0/1.

C:

An ACL definition alone is not applied to interface egress traffic until it is attached with the correct direction.

D:

The direction is outbound but the interface is wrong; filtering Gi0/0 does not provide the requested Gi0/1 egress policy.

Question 663

A campus router must create a named extended IP access list that combines network source/destination/protocol predicates in ordered rules. Which ACL-definition mode should be used?

  1. Enter ip access-list standard NAME and then specify TCP source/destination ports
  2. Create an interface access-group reference before defining any named ACL rules
  3. Use an ip access-list extended NAME definition
  4. Create a route-map NAME with no access-list entries

Explanation

Correct Answer

C:

A named extended ACL groups ordered statements under a recognizable identifier.

Incorrect Answers

A:

A standard ACL mode lacks extended source/destination/protocol matching syntax.

B:

Attaching an undefined/missing ACL cannot replace constructing the actual extended ordered policy.

D:

A route map is not the named extended packet ACL definition asked for.

Question 664

A security policy must deny all IPv4 traffic originating from exact source host 192.0.2.19, regardless of destination. Which extended IPv4 ACL statement addresses that host scope?

  1. Use deny ip any host 192.0.2.19 to block the *destination* host
  2. Use deny tcp host 192.0.2.19 any eq 443 and assume it blocks every IP protocol
  3. Use permit ip host 192.0.2.19 any
  4. Use deny ip host 192.0.2.19 any

Explanation

Correct Answer

D:

The host keyword represents an exact address rather than a subnet range.

Incorrect Answers

A:

That reverses direction: the question denies traffic originating from source 192.0.2.19.

B:

This matches only TCP port 443, not all IPv4 packets from the offending host.

C:

Permit explicitly allows rather than denies traffic from the source host.

Question 665

A named extended ACL STAFF_IN on a Cisco IOS XE switch currently has sequence 10 `deny ip 10.20.30.0 0.0.0.255 any` and sequence 30 `permit ip any any`. One approved exception must allow host 10.20.30.10 to reach any destination before the subnet deny, without allowing other hosts in the subnet or replacing the existing entries. Which exact ACE inserted under `ip access-list extended STAFF_IN` supplies that exception?

  1. 5 permit ip host 10.20.30.10 any
  2. 40 permit ip host 10.20.30.10 any
  3. 5 permit tcp host 10.20.30.10 any eq 80
  4. 5 permit ip 10.20.30.0 0.0.0.255 any

Explanation

Correct Answer

A:

Sequence 5 places a precisely scoped IP host permit before the existing sequence-10 subnet deny; only the approved host gets the first-match exception.

Incorrect Answers

B:

Sequence 40 occurs after the sequence-10 subnet deny; the exception host would already match and be denied before this ACE is reached.

C:

This permits only TCP destination port 80 for the host, not the approved any-IP traffic scope of the exception.

D:

This early permit would exempt every host in 10.20.30.0/24, defeating the requirement to keep the broad network deny for all except one host.

Question 666

An IOS standard or extended ACL must match all sources in IPv4 subnet 192.0.2.0/24. The field is an ACL wildcard mask, not a subnet mask. Which source-prefix and wildcard pair selects that exact network?

  1. 192.0.2.0 255.255.255.0
  2. Use 192.0.2.0 0.0.0.255
  3. 192.0.2.0 0.0.0.0
  4. 192.0.2.0 0.0.255.255

Explanation

Correct Answer

B:

The wildcard for a /24 subnet mask is 0.0.0.255; it fixes the first three octets at 192.0.2 and allows the final octet to vary.

Incorrect Answers

A:

255.255.255.0 is the /24 subnet mask, but IOS ACL address matching uses the inverse wildcard 0.0.0.255.

C:

A wildcard of all zeros matches one host value exactly rather than the full /24 network.

D:

This wildcard ignores the final 16 address bits, covering a much larger /16 selection than required.

Question 667

A Cisco extended ACL must match only the upper 128 addresses of subnet 198.51.100.0/24, starting at 198.51.100.128 and ending at .255. Which base-address/wildcard pair is correct?

  1. 198.51.100.128 0.0.0.255
  2. Use 198.51.100.128 0.0.0.127
  3. 198.51.100.0 0.0.0.127
  4. 198.51.100.128 255.255.255.128

Explanation

Correct Answer

B:

A /25 mask has the inverse wildcard 0.0.0.127. Combined with network 198.51.100.128, it matches the upper half of the /24.

Incorrect Answers

A:

The /24 wildcard ignores all eight last-octet bits, including addresses .0 through .127 that must be excluded.

C:

This base with a /25 wildcard matches the lower half .0 through .127, not the required upper half.

D:

This is neither a valid inverse wildcard for the /25 nor a correct way to restrict that final-octet host range.

Question 668

A security policy needs one exact IPv4 source 203.0.113.11, not neighboring addresses in its /24. What IOS ACL source-address shorthand matches precisely this one host?

  1. 203.0.113.0 0.0.0.255
  2. any
  3. 203.0.113.11 0.0.0.255
  4. Use host 203.0.113.11

Explanation

Correct Answer

D:

The host shorthand is equivalent to a wildcard of 0.0.0.0 for the specified IPv4 address, ensuring an exact one-address ACL match.

Incorrect Answers

A:

This is a /24 wildcard match and includes all host addresses in the source subnet rather than just .11.

B:

Any matches every IPv4 address and is far broader than the single required source.

C:

This wildcard ignores the last eight bits; despite the base ending in .11, it still matches the entire /24.

Question 669

An IOS ACL must select every possible IPv4 source address without constraining the address field. The protocol and destination conditions are supplied elsewhere in the ACE. Which source-address keyword meets this?

  1. host 0.0.0.0
  2. 0.0.0.0 0.0.0.0
  3. Use any in the address match
  4. 255.255.255.255 0.0.0.0

Explanation

Correct Answer

C:

The any keyword is the ACL shorthand for 0.0.0.0 with wildcard 255.255.255.255 and therefore does not restrict the source address.

Incorrect Answers

A:

Host 0.0.0.0 tests one specific 32-bit address; it does not represent every possible client source.

B:

This exact-match wildcard selects only 0.0.0.0 and is not a match-all address selection.

D:

This selects the single 255.255.255.255 address, not all IPv4 host sources.

Question 670

A routed ACL must select the exact IPv4 network 10.10.16.0/20. Addresses outside 10.10.16.0–10.10.31.255 must not match. Which base address and wildcard meet that scope?

  1. 10.10.16.0 0.0.0.255
  2. Use 10.10.16.0 0.0.15.255
  3. 10.10.16.0 0.0.31.255
  4. 10.10.0.0 0.0.15.255

Explanation

Correct Answer

B:

A /20 subnet mask is 255.255.240.0, whose ACL wildcard is 0.0.15.255. With base 10.10.16.0 this matches the requested aligned /20 only.

Incorrect Answers

A:

A /24 wildcard covers only 10.10.16.0–10.10.16.255 and excludes other hosts in the required /20.

C:

This /19-style wildcard includes 10.10.0.0–10.10.31.255 and is broader than the exact /20.

D:

This selects the lower /20 10.10.0.0–10.10.15.255 rather than the requested /20 starting at 16.

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

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