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NEW QUESTION # 53
When source NAT is configured on an enterprise egress device, which of the following may prevent intranet users from accessing the public network?
Answer: A,B,D
Explanation:
The uploaded key includes all four options, but option B is not a valid requirement for normal source NAT and should be removed. Source NAT translates the private source address of outbound traffic into a public address before the packet enters the public network. The public-side router therefore needs reachability to the translated public address for return traffic, not a route to the original private intranet address. By contrast, A can prevent access if NAT is not applied on the proper outbound interface or direction. C can also prevent translation when the configured address pool has no usable address available, depending on the NAT mode and session requirements. D is valid because traffic whose source address does not match the NAT policy or referenced ACL will not be translated; private-source packets then normally cannot traverse the Internet as intended. Routing on the enterprise egress device must of course also be correct, but the specific absence described in B is not inherently a failure when source NAT is working. The verified selections are A, C, and D.
NEW QUESTION # 54
In IPv4, the Options field can extend the header length from 20 bytes up to 60 bytes. To provide support for more options, IPv6 introduces the concept of extension headers. This design allows new options to be added without altering the existing header structure, demonstrating excellent flexibility.
Answer: A
Explanation:
IPv6 was designed to improve flexibility compared to IPv4 by removing the variable-length options field from the base header and introducing extension headers instead. This allows new features and options to be added in a modular way without changing the fixed IPv6 header structure, making the protocol more extensible and efficient.
NEW QUESTION # 55
At the egress of an enterprise campus network, which of the following technologies can the administrator deploy to allow only specific private IP addresses to access the Internet?
Answer: D
Explanation:
At the enterprise campus network egress, the technology used to control which private IP addresses can access the Internet is NAT, typically combined with ACLs. NAT performs address translation for private IPs to public IPs and can be configured with policies to restrict which internal addresses are allowed to be translated and forwarded to the Internet. SSH, FTP, and AAA are not used for traffic forwarding control at the network egress.
NEW QUESTION # 56
The figure shows the simplified topology of an enterprise campus network. On this network, the aging time of dynamic MAC address entries on switches is 300 seconds.
The administrator connects PC1 to GE1/0/1 of SW1 and successfully pings the IP address of PC2 from PC1.
Then, the administrator disconnects the Ethernet cable of PC1
from GE1/0/1 of SW1, immediately connects the cable to GE1/0/2 of SW1, and pings the IP address of PC2 from PC1. Which of the following operations does SW1 perform after receiving a data frame from PC1 when PC1 is connected to GE1/0/2 of SW1?
Answer: D
Explanation:
An Ethernet switch learns MAC address entries dynamically by examining the source MAC address of incoming frames. When SW1 first receives frames from PC1 on GE1/0/1, it creates a MAC address table entry mapping PC1's MAC address to that port. If PC1 later sends frames that arrive on GE1/0/2, SW1 updates the learned entry to reflect the new incoming interface. Therefore, option B is correct: SW1 saves the mapping between PC1's MAC address and GE1/0/2 and removes or overwrites the old mapping associated with GE1/0/1.
Option A is incorrect because a single dynamic MAC address is not normally maintained on two different ports within the same VLAN at the same time; that would cause forwarding ambiguity. Option C is incorrect because a normal move of one MAC address does not require clearing the entire MAC table. Option D is also incorrect because switches update MAC learning dynamically upon receiving new source traffic and do not have to wait for the previous entry to age out. HCIA-Datacom uses this principle to explain MAC address learning, migration, and troubleshooting of loops or host movement in switched Ethernet networks.
NEW QUESTION # 57
The rules in an ACL may overlap. If packets match the rules with loose conditions, the later ACL rules are not processed. In this case, packets cannot match the rules with strict conditions.
Therefore, the rules with strict conditions must be arranged in front lines and those with loose conditions must be arranged towards the end.
Answer: A
Explanation:
Access Control Lists (ACLs) are processed in sequential order, meaning that once a packet matches a rule, subsequent rules are ignored. To ensure that more specific (strict) conditions are applied, strict rules should be listed first, followed by loose rules.
NEW QUESTION # 58
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