Pass the Huawei HCIE-Data Center H12-921_V1.0 Questions and answers with ValidTests

Analysis: NAT66 technology: The carrier assigns a public IPv6 address prefix to the private IPv6 user group, and the public IPv6 prefix may change, and the IPv6 user hopes to obtain it

Public network resources, and there is no need to change the private IP configuration when the public IPv6 prefix changes. In order to meet the above requirements, the NAT66 function is configured on the gateway device at the edge of the network to convert the private network address into the public network address, and protect the privacy and security of the private IPv6 users while accessing the public network to obtain resources . Application scenario: When a data center network is connected to multiple ISPs, you can use NAT66 technology for IPv6 address translation, otherwise you need to configure IPv6 for multiple ISPs address, which increases the O&M workload.

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Resolution: •ECN was originally defined in RFC3168 and is used to define network congestion identity. PFC is defined in 802. 1Qbb, similar to IEEE 802.3x Pause flow control mechanism, but supports independent operation based on each priority, precise control, so that different priorities do not affect each other. 802. 1Q has been evolving, 802. 1Qcz (CI, Congestion

Isolation) is a newly defined protocol standard led by Huawei to solve the problem of PFC Head of Line Blocking (HOLB).

Resolution: Options A and B are correct, multiple virtual interfaces are assigned to multiple containers. Each container has its own protocol address, MAC and IP. Option C is correct, all containers use a sub-interface or VLAN interface on the network interface to access the network that the host can access. The D option is incorrect, please refer to the image below. •Macvlan is one of the features of Linux Kernel, and it is also a network solution that can be natively supported by Docker The configured container network belongs to the same LAN as the host network, and the container has the same network capabilities as the host, and cross-node container access does not require NAT. MacVLANs allow you to configure multiple virtual network interfaces to containers on a network interface or VLAN sub-interface of the host

These virtual network interfaces have separate MAC addresses and IP addresses. •Macvlan requires the physical NIC to support promiscuous mode, and the container gateway is on the physical switch, which has the disadvantage of no IPAM (IP Address Mangement) and container IP Rely on manual configuration and management