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At an insurance company, the on-call technician must permit only TCP connections from 10.119.60.92 to service 192.168.51.107 destination port 443 using extended ACL 172. Which ACE expresses that exact flow?
This extended ACE matches source 10.119.60.92, destination 192.168.51.107, transport tcp, and destination port 443; it permits precisely the stipulated flow.
An ip ACE is broader than the required tcp destination port 443; 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.
The fields match the flow but deny is the wrong action when the requirement is to allow it.
At an airport terminal, a network operations engineer has extended ACL 198 that must check packets as they enter a router interface from source network 10.21.0.0/16. Which interface command applies it in the intended direction?
Applied inbound to the specified interface, ip access-group 198 in evaluates packets arriving from 10.21.0.0/16 before local forwarding.
ip helper-address forwards selected UDP broadcasts to an IP server; 198 is an ACL number, not a helper IP.
access-class is associated with line/VTY access filtering and is not the same interface data-plane ACL attachment.
Outbound placement evaluates packets leaving the interface, not those arriving from the described upstream segment.
At a public library, the infrastructure lead has a broad deny for a maintenance subnet but must allow approved host 10.119.181.16. Which ACL-ordering strategy preserves the explicit exception?
IOS ACLs are processed top-down and stop on the first match. The exception for 10.119.181.16 must appear before a covering deny if it is intended to be permitted.
A host-specific explicit deny would block the very source 10.119.181.16 that needs the exception. The approved host needs a permit before the broader subnet deny, not another earlier deny.
An existing broad deny matching 10.119.181.16 terminates ACL evaluation before the later permit; moving the permit after it cannot restore this source's access.
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.
At a hotel, a network administrator must permit only device 10.59.114.142 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 10.59.114.142; this is the requested single-source permit.
Deny blocks the exact source host when the requirement is to allow it.
This `host` selector identifies only 10.59.114.143, whereas the requirement names 10.59.114.142. One-off differences in the last octet still designate a different IPv4 source.
Wildcard 0.0.0.255 matches an entire last-octet range, not exactly 10.59.114.142. It is overly permissive.
At a biotech lab, the migration lead is choosing placement for a standard IPv4 source ACL covering 10.29.90.0/24; 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 10.29.90.0/24 traffic to unrelated services. Interface context still determines the actual direction.
Inbound source-gateway filtering affects all traffic from the subnet, not only flows to the single protected VLAN in the requirement.
A VTY access-class restricts management terminal login sources, not transit traffic flowing to a server VLAN.
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.
At a logistics provider, the infrastructure lead applies a Cisco IPv4 ACL with several specific permits but no explicit final deny. What happens to a packet from 10.110.33.197 matching no ACE?
IPv4 ACLs have an implicit deny at the end, so packets from 10.110.33.197 that match no prior permit are dropped when the ACL is applied.
The default is not an unconditional permit; a match must be explicitly allowed before the final deny.
An ACL evaluates traffic policy and does not rewrite Ethernet source addresses.
At the end of an IOS IPv4 ACL, implicit deny drops unmatched traffic; it does not fall through to an automatic permit.
At a satellite office, the infrastructure lead must constrain which administrators may open TCP/22 to router 192.168.138.160 without blocking their other approved traffic. What ACL type and placement are suitable?
An extended ACL can match source/destination/protocol and TCP port and is commonly placed close to the source to avoid carrying traffic that must be rejected.
A standard IP ACL cannot match TCP destination port 22; the stated traffic restriction needs a protocol/port-specific extended filter.
Standard ACLs cannot express a destination TCP port; they match source IPv4 addresses only.
Helper addresses relay selected UDP broadcasts and do not replace TCP management traffic filtering.
At a design agency, a network administrator needs standard IPv4 ACL 15 to permit source subnet 10.129.23.160/27 before applying an implicit deny. Which ACE matches the requested source range?
The wildcard 0.0.0.31 is the bitwise inverse of subnet mask 255.255.255.224, matching all sources in 10.129.23.160/27. A standard ACL matches source IPs rather than destination TCP ports.
The subnet mask 255.255.255.224 is not the wildcard; entering it in an IOS access-list match can select the opposite bits.
This wildcard 0.0.0.255 selects a different address set than 10.129.23.160/27; the zeros/ones in the wildcard control which bits must match.
Even with a correctly sized source range, deny blocks the required hosts rather than permitting them.
At a school district, the branch support lead must permit only TCP connections from 10.153.115.45 to service 192.168.82.4 destination port 80 using extended ACL 124. Which ACE expresses that exact flow?
This extended ACE matches source 10.153.115.45, destination 192.168.82.4, transport tcp, and destination port 80; 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 80; 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.
At an enterprise data center, the security and networking lead has extended ACL 147 that must check packets as they enter a router interface from source network 10.106.0.0/16. Which interface command applies it in the intended direction?
Applied inbound to the specified interface, ip access-group 147 in evaluates packets arriving from 10.106.0.0/16 before local forwarding.
access-class is associated with line/VTY access filtering and is not the same interface data-plane ACL attachment.
Outbound placement evaluates packets leaving the interface, not those arriving from the described upstream segment.
ip helper-address forwards selected UDP broadcasts to an IP server; 147 is an ACL number, not a helper IP.
An extended IOS ACL must allow HTTPS from 192.0.2.10 to 198.51.100.20 but deny other traffic from 192.0.2.0/24. The first current ACE is `deny ip 192.0.2.0 0.0.0.255 any`. Which edit preserves the exception?
Cisco ACLs process ACEs in order and stop on the first matching entry. The specific permit must precede the broader matching deny so approved HTTPS traffic reaches it.
The broad deny matches the approved source first; a later permit cannot be reached for the same packet.
Logging a deny does not permit the required connection; an explicit allow ACE is still needed before the broad denial.
Implicit deny blocks unmatched traffic, including the desired HTTPS flow unless an explicit permit is placed before it.
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