FILL BLANKOn the network shown in the figure, an IGMP querier may need to manage a large number of group members. When a large number of hosts frequently join or leave multicast groups, a large number of Report/Leave messages are generated, placing a burden on the IGMP querier. To reduce pressure on the IGMP querier, you can configure IGMP _____ on the Layer 3 switch, so that the Layer 3 switch aggregates Report/Leave messages before sending them to the IGMP querier. (Use full spelling with the first letter capitalized.)
Answer(s): A
To reduce the burden on the IGMP querier, you can configure IGMP Proxying on the Layer 3 switch. IGMP proxying allows the switch to aggregate Report/Leave messages from multiple hosts and forward them as a single message to the IGMP querier, thus reducing the number of messages the querier needs to process.
IP multicast effectively conserves network bandwidth and reduces network load. Therefore, it is widely used in network services, such as IPTV, real-time data transmission, and multimedia conferencing.
IP multicast is an efficient method for transmitting data to multiple recipients simultaneously, making it ideal for services like IPTV, real-time data transmission, and multimedia conferencing. By using multicast, bandwidth is conserved as data is sent only once and shared by all receivers, reducing network load.
When IPv4 unicast packets are transmitted over Ethernet, their destination MAC address is also a multicast MAC address. If the IP address of a multicast group is 224.0.1.1, which of the following is the corresponding multicast MAC address?
Answer(s): B
The corresponding multicast MAC address for the multicast group IP address 224.0.1.1 is 01-00-5e-00-01-00.The MAC address for an IPv4 multicast address is derived by setting the first three bytes to 01-00-5e, and the last three bytes are the lower 23 bits of the multicast IP address. For the IP address 224.0.1.1 (in hexadecimal:E0 00 01 01), the MAC address is 01-00-5e-00-01-00.
The Internet Assigned Numbers Authority (IANA) allocates Class D addresses to IPv4 multicast. An IPv4 address is 32 bits long, and the four most significant bits of a Class D address are 1111.
Class D addresses are used for IPv4 multicast, and they are identified by the first four most significant bits being 1111. This means that Class D addresses range from 224.0.0.0 to 239.255.255.255, and these addresses are allocated for multicast purposes.
FILL BLANKIn BGP, Keepalive messages are used to maintain BGP peer relationships. When a BGP router receives a Keepalive message from a peer, the BGP router sets the state of the peer to Established and periodically sends Keepalive messages to maintain the connection. By default, the device sends Keepalive messages every ______ seconds. (Enter only digits.)
By default, BGP routers send Keepalive messages every 60 seconds to maintain the BGP peer relationship. This interval can be adjusted through configuration if needed.
In BGP, the AS_Path attribute records the numbers of all ASs that a route passes through from the local end to the destination in the vector order. Which of the following statements is false about the attribute change during route transmission?
Answer(s): C
When advertising the route to an IBGP peer, the BGP speaker creates an empty AS_Path in the Update message.When advertising a route to an IBGP peer, the AS_Path attribute is not empty. Instead, the BGP speaker does not modify the AS_Path since the route has not passed through a different AS. The AS_Path attribute is carried unchanged in the update sent to an IBGP peer.
An IP prefix list is a common matching tool in routing policies. When an IP prefix list is configured on a Huawei router, which of the following parameters are optional? (Choose all that apply.)
Answer(s): C,D
Mask length: This is optional when configuring an IP prefix list. The mask length specifies the length of the subnet mask for the IP prefix, but it can be omitted if not required for the specific match.Shortest mask length to be matched: This is also optional. You can specify the shortest mask length to match in the prefix list, but it is not mandatory.
Both MQC and PBR can be applied on device interfaces to filter received and sent packets or control packet forwarding paths.
Both MQC (Modular Quality of Service Command-Line Interface) and PBR (Policy-Based Routing) can be applied on device interfaces to filter received and sent packets or control packet forwarding paths. MQC is used for defining QoS policies, while PBR allows for routing decisions based on policies instead of just the destination IP address.
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