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Question 650
An IPsec site tunnel should protect traffic between 10.10.0.0/16 and 172.16.0.0/16, but not all Internet traffic. Which mirrored selector/route policy defines this permitted protected flow scope?
- Set a universal 0.0.0.0/0 to 0.0.0.0/0 selector for every Internet flow
- Use a source selector of 10.10.0.0/8 rather than the approved /16
- Define the protected traffic selectors and routing policy
- Create selectors for only one direction and omit reciprocal peer configuration
Explanation
Correct Answer
C:IPsec protects the traffic that matches its configured tunnel selectors and routing.
Incorrect Answers
A:This would include unrelated public traffic instead of only the two authorized protected subnets.
B:That is a much broader private network and would include unapproved site traffic.
D:Site-to-site policy must agree on the intended bidirectional protected traffic between the two endpoints.
Question 651
An IPv4 extended ACL is applied inbound on a router's client-facing uplink, where HTTP requests arrive from upstream users before being forwarded to a downstream web-server VLAN. The policy must permit TCP requests from any client to the server 10.20.30.10 on destination port 80. Which ACE matches that incoming request traffic exactly?
- permit icmp any host 10.20.30.10 echo
- permit tcp any host 10.20.30.10 eq 80
- permit tcp any host 10.20.30.10 eq 443
- permit ip any host 10.20.30.10
Explanation
Correct Answer
B:The inbound uplink receives client-to-server requests; this ACE matches TCP from any client to the exact web-server host with destination port 80.
Incorrect Answers
A:This permits ICMP echo traffic, not the required TCP HTTP requests to destination port 80.
C:TCP destination port 443 normally matches HTTPS, not the HTTP destination port 80 in the stated policy.
D:This ACE matches all IPv4 protocols to the server and is too broad for the requirement to permit only TCP destination port 80.
Question 652
An IOS extended ACL is applied inbound on an interface receiving packets from a web-server segment. The server is `10.20.30.10`, and the team needs a narrowly scoped permit for IPv4 TCP packets sourced from that server’s HTTPS port 443 toward clients. Which ACE puts `eq 443` on the correct side?
- permit tcp any host 10.20.30.10 eq 443
- permit tcp host 10.20.30.10 eq 443 any
- permit udp host 10.20.30.10 eq 443 any
- permit ip host 10.20.30.10 any
Explanation
Correct Answer
B:In IOS extended ACL syntax the first port operator follows the source address. This ACE matches packets from host 10.20.30.10 with TCP source port 443 toward clients; it is still a stateless match, not automatic session validation.
Incorrect Answers
A:This matches clients headed to the server’s destination port 443. It does not match the specified server-to-client direction with TCP source port 443.
C:HTTPS as specified uses TCP; a UDP ACE for source port 443 matches a different transport and would not satisfy the TCP requirement.
D:An IP-wide permit does not restrict the source to TCP port 443 and could allow unrelated protocols from that host.
Question 653
An IOS extended ACL must block every packet sourced from IPv4 subnet 192.0.2.0/24, regardless of destination, with a single network-specific deny ACE. Which wildcard-based syntax states exactly that source prefix?
- deny ip 192.0.2.0 255.255.255.0 any
- deny ip host 192.0.2.0 any
- deny ip any 192.0.2.0 0.0.0.255
- Use deny ip 192.0.2.0 0.0.0.255 any
Explanation
Correct Answer
D:The wildcard 0.0.0.255 ignores the last 8 bits while matching 192.0.2 in the first three octets. As a source selector it covers the requested /24 regardless of destination.
Incorrect Answers
A:An ACL wildcard mask is the inverse of the subnet mask; 255.255.255.0 is not the wildcard for /24.
B:This matches only the one host address 192.0.2.0 rather than every host in the /24 source range.
C:This applies the /24 as the destination network instead of the source and reverses the stated policy direction.
Question 654
An IPv4 extended ACL must permit ping **echo requests** from any source to server 10.20.30.10, while continuing to filter TCP web sessions separately. Which ACE matches only the desired ICMP request type?
- permit tcp any host 10.20.30.10 eq 80
- permit icmp any host 10.20.30.10 echo-reply
- permit ip any host 10.20.30.10
- Use permit icmp any host 10.20.30.10 echo
Explanation
Correct Answer
D:An ICMP echo ACE matches request packets to this host. It is distinct from an ICMP echo-reply, TCP 80, or a protocol-wide IP permit.
Incorrect Answers
A:This permits TCP HTTP sessions, not the ICMP echo-request protocol and message type asked for.
B:The echo-reply keyword matches responses rather than incoming echo requests to this server.
C:Permit ip would match all IP protocols to the destination and is broader than the explicit ICMP echo-only rule.
Question 655
An IOS extended ACL explicitly permits authorized HTTPS, SSH and DNS flows. All other IP traffic must be denied and the security team requests a log entry for unmatched packets. What final ACE should be placed after the permitted services?
- Add a final explicit deny ip any any log
- permit ip any any
- deny tcp any any eq 80
- deny ip host 192.0.2.19 any
Explanation
Correct Answer
A:An explicit deny ip any any log placed last denies all otherwise unmatched IPv4 packets and requests logging; an implicit deny exists but does not itself provide the specified explicit log operation.
Incorrect Answers
B:A final permit would bypass the intended default deny policy for every flow not matched earlier.
C:This denies only TCP destination port 80 and leaves other protocol types to the subsequent implicit deny without requested logging.
D:This blocks only one source and does not explicitly log all other unmatched traffic as required.
Question 656
An extended ACL is read from top to bottom. An exception must permit host 192.0.2.5, but a later rule denies the entire 192.0.2.0/24 source network. Which order preserves the exception?
- Put the covering /24 deny before the host permit
- Put both entries in any order because ACLs choose the most specific ACE
- Remove the permit and rely on the implicit deny to allow the host
- Place more-specific permit statements before covering denies
Explanation
Correct Answer
D:IOS ACLs use the first matching statement; the host-specific permit must precede the broader source-prefix deny for that host traffic to be accepted.
Incorrect Answers
A:The first matching deny stops ACL evaluation, so the later host-specific permit is never considered for that host.
B:ACLs are evaluated by configured sequence, not by routing-style longest-prefix selection among ACL statements.
C:An implicit deny blocks unmatched traffic and cannot be used to permit an exception.
Question 657
An extended IPv4 ACL lists several permits and denies but has no explicit final catch-all entry. A packet matches none of the configured ACEs. What is the resulting IOS ACL disposition?
- Permit because unmatched packets fall through to ordinary routing
- Apply the implicit deny
- Repeat the ACL from the first line until a permit matches
- Send the packet to the DNS resolver to obtain a matching rule
Explanation
Correct Answer
B:An implicit deny ip any any concludes an IPv4 ACL; packets that fail every explicit permit or deny statement are denied by default.
Incorrect Answers
A:IOS ACLs have an implicit deny at the end, so a packet that matches no explicit ACE is not automatically permitted.
C:ACL evaluation terminates after the ordered list; unmatched traffic does not loop through the ACEs.
D:ACL matching uses address, protocol and port fields and does not synthesize new rules through DNS.
Question 658
An IOS router uses a standard IPv4 ACL to filter packets solely by the address of the originating subnet, not by TCP destination port or recipient IP. Which field can a conventional standard ACL match?
- Match both source and destination addresses with a standard numbered ACL
- Match TCP destination eq 443 with a conventional standard ACL
- Match source IP addresses only
- Match an Ethernet destination MAC using a standard routed IPv4 ACL
Explanation
Correct Answer
C:Standard IPv4 ACL matching is source-oriented and cannot select destination TCP ports.
Incorrect Answers
A:Traditional standard IPv4 ACLs match source IPv4 addresses, not destination IP predicates.
B:Transport protocol/port matching requires an extended ACL, not standard source-only filtering.
D:MAC-based filtering is a different mechanism; standard IPv4 ACLs evaluate source IPv4 addresses.
Question 659
A rule must match TCP packets from one IPv4 subnet to a specific host only on destination port 443. Which ACL type supports source, destination and transport-port matching?
- Use an extended ACL
- Use a standard ACL to match source, destination and destination TCP port simultaneously
- Use only switchport MAC address restrictions for the destination port
- Use a route map with no packet ACL entry and assume all port 443 flows are filtered
Explanation
Correct Answer
A:Extended ACL statements can match protocol, IP endpoints and eligible transport ports.
Incorrect Answers
B:Standard IPv4 ACLs cannot match the full source/destination/transport-port tuple required.
C:MAC-based port security is not the IPv4 TCP transport port 443 predicate.
D:A route map without appropriate matching/enforcement is not the specified packet-filtering ACL.
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?
- Run show ip route and infer which ACL line denied the session
- Use show access-lists or the ACL display
- Run show logging only and assume every ACL rule count is logged
- 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.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests