H12-821_V1.0 Exam Questions

Rapid detection technology can detect communication failures with adjacent devices as early as possible so that the system can take timely measures to ensure uninterrupted business...

In medium and large WLAN networks, if the VLAN Pool uses HASH to allocate VLANs, the number of users in each VLAN will be evenly divided.

IS-IS cannot run on point-to-multipoint links P2MP (Point to MultiPoint)

BGP peers can send incremental BGP routing updates or perform periodic updates.

RPF has the function of preventing multicast forwarding loops.

As shown in the figure, network administrator A can control the path of traffic entering AS100 after modifying the MED value of the routing entries sent to R2 on the R1 router thro...

If an IS-IS device is configured on a device, the minimum time it takes to sense a neighbor failure is seconds. However, after being associated with BFD, BFD can replace the hello...

In the OSPF routing protocol, the only LSA types involved in intra-area route calculation are Router LSA, Network LSA, and Summary LSA.

On the VRP platform, when we introduce IS-IS routing into the OSPF protocol, if COST is not specified, the cost value will be set to 20 by default.

An additional packet loss strategy uses the tail drop (Tail-Drop) method. This drop method will cause the TCP global synchronization rate.

The default value of the ospf dr-prioritye command is 1, and the value range is 0~255.

OSPF supports multiple processes. Multiple different OSPF processes can run on the same router. They do not affect each other and are independent of each other. The routing interac...

When deploying the service packet, the modular switch first processes it through the uplink interface board, then processes it through the downlink interface board, and finally sen...

For specific routing protocols, such as OSPF and IS-IS, using filter-policy to filter routes in the inbound direction can block the transmission of link state information, so that...

Route aggregation in BGP will cause the AS_Path attribute to be lost, which may cause the risk of loops.

In the BGP system, by default, BGP will automatically aggregate imported routes.

When dual-link hot backup is configured in a WLAN group, the AP will establish CAPWAP links with the primary AC and backup AC respectively.

Inter-area routing applies to inter-area topics. OSPF stipulates that routing information is not allowed to be published directly between two non-backbone areas. Routing informatio...

The OSPF network type that does not elect DR/BDR is p2p type.

When a routing protocol introduces other routing protocols, in order to only introduce a part of the routing information that meets the conditions and set certain attributes for th...

OSPF supports multiple equal-cost links between node A and node B, but equal-cost load sharing is not implemented. The possible reason is that OSPF limits the number of maximum loa...

OSPF roles are defined in RSTP. The Port role values of the Alternate port and the Backup port are consistent in the Flags field of the packet, both are 01.

The original SDN is the separation of transfer and control. The separation of transfer and control is a method to realize SDN but not the essence.

NFV and SDN are highly complementary and interdependent, so they must be used together.

OSPF supports two authentication methods: regional authentication and interface authentication. If these two authentication methods are configured at the same time, interface authe...

After dividing an interface of the firewall into the Untrust security zone, the interface belongs to the Untrust zone and no longer belongs to the Local zone.

Type 7 LSA does not exist in the Stub area and Totally Stub area.

A physical interface bound to the VRF instance cannot be divided into sub-interfaces.

The routing selection tool route-policy can filter and set BGP attributes based on predefined conditions, so it is often used to define policies for BGP Peer and is used to control...

Multiple BGP processes cannot be configured on one router.

The import-route limit command cannot limit the maximum number of external routes that can be imported in an OSPF process.

An ISIS router with an interface priority of 0 cannot participate in DIS election.

Two level-1 routers in different areas can form neighbor relationships.

The technology that separates the control plane and forwarding plane is SDN.

OSPF only advertises changed routes to neighbors.

The OSPF Stub area does not flood Type 5 LSAs and Type 4 LSAs into the Stub area, but advertises a default LSA to the Stub area to guide the data packets on how to reach the destin...

The service IP address and virtual IP address of VRRP can be the same.

The function of routing protocol priority is to assign different priorities to routes discovered by different protocols, so that when a router learns the same route from different...

The routing message appears when the administrator configures OSPF. The reason is Router-ID conflict.

When the BGP versions supported by two BGP neighbors are inconsistent, the neighbors will negotiate to use the highest BGP version supported by both ends.

After the IGMP proxy device receives the report message of a certain multicast group, if the corresponding multicast group is not found, the IGMP proxy device will send a report me...

Two routers R1 and R2 are directly connected. If you want to establish an OSPF adjacency relationship, R1 uses MD5 port authentication, and R2 uses MD5 area authentication. If the...

SDN and NFV are essentially the same concept, both describing network function virtualization.

SSH uses asymmetric encryption algorithms AES and DES to achieve data transmission security, and uses HMAC to ensure data integrity.

In BGP routing rules, routes with higher MED values are given priority.

By default, VRP requires manual operation to resend an Update message to the neighbor after the BGP neighbor's egress routing policy (route-policy) changes.

Routes learned through the Network mode in BGP do not necessarily have to be routing entries that exist in the IP routing table. At the same time, the routes injected in this way a...

When the routers exchange database information through DD messages, a master-slave relationship is first formed. The one with the larger DR Priority becomes the master router, and...

ACL is essentially a packet filter. Only when ACL is applied in the business module can ACL take effect.

SDN architecture mainly includes two interfaces: NBI northbound interface and SBI southbound interface.