H12-821_V1.0 Exam Questions

The VNI field length of VXLAN packets is 24 bits.

After checking the IP address of an interface of the firewall on the firewall, these packets will be handed over to the internal module of the firewall for processing and will not...

The Local_Preference attribute is used to determine the best route for traffic leaving the AS. When multiple routes with the same destination address but different next hops are ob...

The goal of network management is to monitor, test, configure, analyze, evaluate and control network software and hardware to ensure normal network operation.

Link state information is isolated by default between different IS-IS processes on the same router.

The IS-IS (L2) routing table entry lacks inbound interface information, so multicast traffic cannot be forwarded based only on the (*, G) table.

L2TP is a type of VPDN (Virtual Private Dial-up network) tunnel protocol. It is a VPN that provides access services for traveling employees or corporate branches to remotely access...

When running OSPFv3 on a Huawei router, the OSPFv3 process will automatically select an interface address as the Router ID of the process.

To implement the traffic filtering function, you can use traffic-filter or MQc. Compared with traffic- filter, MQc can be called in more views.

After a BGP connection is established, without load balancing configured, the BGP Speaker only advertises the best route in the BGP routing table to the neighbor.

The matching results of ACL include "match (allow)", "match (deny)" and "no match".

VXLAN is based on UDP encapsulation, which encapsulates Ethernet data frames on UDP in IP packets, so it is called MAC in UDP encapsulation.

The basic header length of IPv6 messages is a fixed value.

IPv6 link-local addresses can be generated through stateless autoconfiguration.

SAC (controller can intelligently adjust traffic paths according to network status to improve the throughput of the entire network.

If the MSTP VR ID IP has only one BPDU type, its value is 2, and there is no TCN BPDU.

The router directly guides the forwarding of data according to the FIB forwarding table.

VXLAN users can access the Internet through the VXLAN interface.

APs and users in WLAN, if it wants to continue to access the home network, it can set the HAC or HAP as the home agent.

VLAN Pool can support multiple service VLANs at the same time mainly through one SSID, thus reducing the broadcast domain and reducing the waste of IP addresses.

The DHCP relay is responsible for forwarding DHCP messages between the DHCP server and the DHCP client, and assists the DHCP server in dynamically allocating network parameters to...

In a scenario where the device status changes to Master, it will immediately send free ARP to refresh the MAC table entry of the downstream device, thereby directing user traffic t...

By default, VRP will automatically aggregate the routes introduced by BGP.

The BGP_AS_PATH attribute is an optional transition attribute.

Using NAT technology, only the network layer information (IP address) in the data packet can be translated.

On the rendezvous poin! RP, the rendezvous point is an important PIM router in the network. Whether a static RP or a dynamic RP is set, you can specify which multicast groups the R...

One of the features of OSPF is that it only supports MD5 authentication.

When two routers establish a pair of logical BGP peers through a multi-hop physical link, the peer connect-interface command must be used.

OSPF and PDR, can only be called under the layer 3 interface of the device.

If multiple devices with the same priority compete for the Master role at the same time, the device with the interface with the smaller IP address should be selected as the Master...

The IGMP protocol runs between an IP host and its directly connected multicast router to maintain multicast group membership.

If the DR Priority of a certain router is set to 0, then the router interface is allowed to be elected as a DR or BDR, but it has the lowest priority.

For a router running the OSPF protocol, all interfaces must belong to the same area.

When IGMP query is configured with SSM Mapping rules, SSM services can only be provided to member hosts running IGMPv2.

When a switch is powered on, it joins a running stack system. This behavior is called stack joining.

TTL is the function of preventing loops in multicast.

Both policy routing and routing policies can affect the forwarding process of data packets, but they affect data packets in different ways. Policy routing is policy-based forwardin...

If the DR priority is set to 0, then in the OSPF routing domain, the router is allowed to be elected as DR or BDR, but it has the lowest priority.

A VRRP virtual router can only have virtual IP addresses.

Two routers running IS-IS can establish an adjacency relationship only if the time interval between IIH sending is the same.

After modifying the OSPF network type of the interface under the interface, you need to restart the device or reset ospf. Otherwise ospf will not take effect.

After establishing a neighbor relationship between the two DRother routers R1 and 2 in the MA network, execute the [R1] display ospf peer command in R1. At this time, the neighbor...

In the MA network, after the DR and BDR election is completed, if the BDR fails, the DRother will re-elect a new BDR until the original BDR returns to normal.

BFD determines whether a fault has occurred by periodically detecting packets. It is a fast fault detection mechanism that relies on routing protocols.

When the Hold Time supported by two devices running BGP is inconsistent, the neighbors will negotiate to use the smaller time as the Hold Time interval.

To implement the system from misjudging roaming with the same VLAN ID but in different subnets as Layer 2 roaming, you need to use the roaming domain to determine whether the devic...

After the tracking can find the attack source user or attack source interface based on the information in the attack packet, so that the administrator can be alerted through alarms...

OSPF type 2 external routing cost is the sum of AS internal cost (cost from router to ASBR) and AS external cost.

BGP establishes neighbor relationships through UDP interaction.

In OSPF, the DR and BDR elected in a broadcast network listen to both the 224.0.0.5 address and the 224.0.0.6 address.