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At an insurance company, the campus network lead is choosing placement for a standard IPv4 source ACL covering 10.30.143.0/24; only one destination segment should be restricted. Which practice is most suitable?
A standard IPv4 ACL matches only source addresses, so destination-side placement can reduce unintended blocking for 10.30.143.0/24 traffic to unrelated services. Interface context still determines the actual direction.
An interface description is documentation, not a packet-match field; source-only standard ACL evaluation cannot distinguish separate destination IPs.
This location filters the source at a broad point in its path, denying access to unrelated destinations too. A standard source-only ACL should be scoped near the intended protected destination.
The requirement is destination-specific; a broad placement would deny permitted traffic to other segments.
An IOS standard ACL must allow source IPv4 subnet 10.41.207.64/26 and then rely on the usual implicit deny for other sources. Which ACE matches exactly the permitted subnet?
Standard ACL 20 uses the wildcard complement 0.0.0.63 for prefix 10.41.207.64/26. This source match permits exactly the IPv4 subnet range described.
IOS wildcard values are not dotted subnet masks; 255.255.255.192 would mean a different set of address bits may vary.
The wildcard 0.0.0.31 is a different mask from the inverse of /26 and matches a narrower range than 10.41.207.64/26.
Even with correct wildcard bits, deny rejects all sources in 10.41.207.64/26; the policy requests a permit.
A branch permits administrator subnet 192.0.2.0/24 to manage router 198.51.100.1 on TCP/22, but should block TCP/23 from those same administrators without affecting HTTPS user traffic. Which ACL capability is required?
Extended ACLs can distinguish SSH from Telnet by destination TCP ports while preserving other permitted services if ordered and placed correctly.
A standard ACL only tests source IP; it cannot permit TCP/22 but deny TCP/23 for the same source/destination pair.
DHCP relay handles client DHCP broadcasts, not management protocol policy enforcement.
Routing delivers packets to destinations and is not, by itself, a protocol/port-based access filter.
At a regional hospital, the site engineer needs standard IPv4 ACL 15 to permit source subnet 10.96.57.0/25 before applying an implicit deny. Which ACE matches the requested source range?
The wildcard 0.0.0.127 is the bitwise inverse of subnet mask 255.255.255.128, matching all sources in 10.96.57.0/25. A standard ACL matches source IPs rather than destination TCP ports.
This wildcard 0.0.0.255 selects a different address set than 10.96.57.0/25; the zeros/ones in the wildcard control which bits must match.
The subnet mask 255.255.255.128 is not the wildcard; entering it in an IOS access-list match can select the opposite bits.
Even with a correctly sized source range, deny blocks the required hosts rather than permitting them.
At a distribution center, the migration lead must permit only TCP connections from 10.158.149.52 to service 192.168.118.41 destination port 53 using extended ACL 185. Which ACE expresses that exact flow?
This extended ACE matches source 10.158.149.52, destination 192.168.118.41, transport tcp, and destination port 53; it permits precisely the stipulated flow.
The fields match the flow but deny is the wrong action when the requirement is to allow it.
An ip ACE is broader than the required tcp destination port 53; it would permit unrelated protocols and ports.
This reverses source and destination and describes the opposite direction of traffic. Extended ACL addresses are ordered source then destination.
A standard ACL 12 already permits management subnet 192.0.2.0/24. Administrators want to restrict which source hosts can start VTY SSH sessions to a router, without filtering transit traffic. Where should this ACL be applied?
VTY access-class checks sources permitted to access the router’s virtual terminal lines. This is separate from interface packet-forwarding ACLs.
An interface data-plane ACL can affect forwarded traffic and is not the targeted VTY login restriction.
DNS name resolution settings cannot use a standard access-class to restrict terminal sessions.
VLAN assignment controls Ethernet membership, not which remote IP hosts may open management sessions.
At a distribution center, a network operations engineer has a broad deny for a maintenance subnet but must allow approved host 10.50.159.106. Which ACL-ordering strategy preserves the explicit exception?
IOS ACLs are processed top-down and stop on the first match. The exception for 10.50.159.106 must appear before a covering deny if it is intended to be permitted.
A host-specific explicit deny would block the very source 10.50.159.106 that needs the exception. The approved host needs a permit before the broader subnet deny, not another earlier deny.
The `log` modifier records a deny match; it does not permit the packet or change first-match ACL processing. A permit earlier in the list is required.
An existing broad deny matching 10.50.159.106 terminates ACL evaluation before the later permit; moving the permit after it cannot restore this source's access.
At a design agency, the site engineer must permit only device 10.110.177.165 as a source in a standard IPv4 ACL. Which ACE uses IOS host matching correctly?
The host keyword is equivalent to wildcard 0.0.0.0 and matches only IPv4 address 10.110.177.165; this is the requested single-source permit.
Wildcard 0.0.0.255 matches an entire last-octet range, not exactly 10.110.177.165. It is overly permissive.
Deny blocks the exact source host when the requirement is to allow it.
This `host` selector identifies only 10.110.177.166, whereas the requirement names 10.110.177.165. One-off differences in the last octet still designate a different IPv4 source.
At a payment processor, the infrastructure lead is choosing placement for a standard IPv4 source ACL covering 10.27.185.0/24; only one destination segment should be restricted. Which practice is most suitable?
A standard IPv4 ACL matches only source addresses, so destination-side placement can reduce unintended blocking for 10.27.185.0/24 traffic to unrelated services. Interface context still determines the actual direction.
This location filters the source at a broad point in its path, denying access to unrelated destinations too. A standard source-only ACL should be scoped near the intended protected destination.
Filtering at the branch egress would cut off legitimate external destinations instead of confining the restriction to the protected subnet.
MAC-source matching and IP-source prefix matching are different fields. A Layer 2 MAC filter does not implement this specified source IPv4 ACL.
An IOS standard ACL must allow source IPv4 subnet 10.95.188.128/25 and then rely on the usual implicit deny for other sources. Which ACE matches exactly the permitted subnet?
Standard ACL 20 uses the wildcard complement 0.0.0.127 for prefix 10.95.188.128/25. This source match permits exactly the IPv4 subnet range described.
Even with correct wildcard bits, deny rejects all sources in 10.95.188.128/25; the policy requests a permit.
IOS wildcard values are not dotted subnet masks; 255.255.255.128 would mean a different set of address bits may vary.
The wildcard 0.0.0.63 is a different mask from the inverse of /25 and matches a narrower range than 10.95.188.128/25.
Traffic enters router GigabitEthernet0/0 from users and must be filtered before it reaches a sensitive server. The extended ACL was mistakenly applied `out` on GigabitEthernet0/0. What change puts filtering on the user-to-router ingress path?
ACL interface directions are relative to the router. Incoming client packets enter Gi0/0, so the matching data-plane filter belongs inbound there under the stated topology.
`out` on Gi0/0 describes packets leaving the router through that port, not packets arriving from users.
A VTY access-class restricts terminal management sessions and does not replace an extended interface ACL for general user-to-server transit traffic.
Shutting the interface removes permitted as well as disallowed traffic, not a valid correction of ACL direction.
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