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When the IP address lease of a DHCP client reaches a specified point, the DHCP client renews the IP address lease. The number of times for sending renewal packets decreases as the number of times for IP address renewal increases.
To facilitate subsequent management, a university wants to use double-tagged VLANs. The inner VLAN tag is used to identify users, and the outer VLAN tag is used to identify services. Which VLAN attribute should be used?
Double-Tagged VLANs :
Double-tagging involves adding two VLAN tags to a packet:
Inner VLAN Tag : Identifies users or devices.
Outer VLAN Tag : Identifies services or networks.
VLAN Attributes :
QinQ : Adds an outer VLAN tag to an already tagged packet, enabling double-tagging.
Stacking : Similar to QinQ but less commonly used.
Common : Supports only single-tag VLANs.
Scenario Analysis :
The university requires double-tagging for user and service identification.
The QinQ attribute is specifically designed for this purpose.
Why C?
The QinQ attribute supports double-tagging, making it the correct choice for this scenario.
Thus, the correct answer is C .
HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.
IEEE 802.1ad QinQ Standards .
The customer needs to access the following information points: AP, PC, IP camera, and IPTV. The AP is powered by the ONU. The types of ONU interfaces include:
GE (PoE):Powers the AP.
GE:Connects to PC, IP camera, and IPTV.
The routing table of a router contains the following two entries:
Destination/Mask Protocol Pre Cost Nexthop Interface
9.0.0.0/8 OSPF 10 50 1.1.1.1 Serial0
9.1.0.0/16 RIP 100 5 2.2.2.2 Ethernet0
If the router needs to forward packets with the destination address of 9.1.4.5, which of the following statements is correct?
When a router forwards packets, it selects the route with the longest prefix match (most specific route) for the destination address.
First Route : Matches 9.0.0.0/8, which covers all IP addresses starting with 9.
Second Route : Matches 9.1.0.0/16, which is more specific and covers IP addresses starting with 9.1.
For the destination address 9.1.4.5 , the second route (9.1.0.0/16) is a better match because it is more specific than the first route (9.0.0.0/8).
Option A : Incorrect. OSPF has a higher priority, but the longest prefix match takes precedence over priority.
Option B : Correct. The second route matches the destination address more accurately.
Option C : Incorrect. Metric is not considered when comparing routes with different prefix lengths.
Option D : Incorrect. Interface speed is irrelevant in route selection.
HCIA Huawei ACCESS Official Documentation , Chapter: IP Routing Table Selection.
Routing Principles and Longest Prefix Match by Huawei.
If a broadband user account passes the authentication but all web pages cannot be accessed, the possible causes can be:
Firewall Settings (Option A) :
Incorrect firewall settings on the PC can block outbound HTTP/HTTPS traffic, preventing access to web pages.
Browser Settings (Option B) :
Misconfigured browser settings (e.g., proxy settings in Internet Explorer) can prevent the browser from connecting to websites.
Upper-Layer Device Configuration (Option C) :
Incorrect configurations on upper-layer devices (e.g., NAT, routing, or DNS settings) can prevent proper communication between the user and external networks.
Website Server Fault (Option D) :
If the issue affects all web pages , it is unlikely to be caused by a single website server being faulty. This option is irrelevant in this scenario.
Why A, B, C?
These options directly address potential issues that could prevent access to all web pages after successful authentication.
Thus, the correct answers are A, B, C .
HCIA Huawei ACCESS Official Documentation , Chapter: Broadband Troubleshooting.
Broadband Access Network Fault Analysis by Huawei.
