By default, the OSPF port cost is related to the bandwidth of the port. The calculation formula is bandwidth-reference/bandwith. The port cost can only be calculated by OSPF and cannot be changed manually.
A . True
B . False
Answer: B
On non-broadcast networks, OSPF has two operating modes, non-broadcast multiple access and point-to-multipoint, and non-broadcast multiple access requires election of DR/BDR.
On non-broadcast networks, OSPF has two operating modes, non-broadcast multiple access and point-to-multipoint, and non-broadcast multiple access requires election of DR/BDR.
A . True
B . False
Answer: A
The following description of Local-Preference, which is correct?
The following description of Local-Preference, which is correct?
A . Local-Preference is recognized as mandatory.
B . Local-Preference affects the traffic entering the A
D . Local-Preference can be spread across A
F . The default value of Local-Preference is 100.
Answer: D
Agreate command (aggregate ipy4-address { mask | mask-length } [ as-set I attribute-policy route-policy-name1 I detail-suppressed I origin-policy route-policy-name2 I suppress-policy route-policy-name3]) There are several parameters that can be used to control the aggregation process and results, which of the descriptions are wrong? (Multiple choices)
Agreate command (aggregate ipy4-address { mask | mask-length } [ as-set I attribute-policy route-policy-name1 I detail-suppressed I origin-policy route-policy-name2 I suppress-policy route-policy-name3]) There are several parameters that can be used to control the aggregation process and results, which of the descriptions are wrong? (Multiple choices)
A . Configure the as-set parameter. The generated AS-Path of an aggregated route contains all the AS-Paths of the detailed route. The AS-Path is ordered to avoid routing loops.
B . The suppress-policy can generate an aggregated route, but suppress the detailed route matching the route-policy to advertise to other neighbors. You can use the if-match clause of the route-policy to selectively suppress some specific routes. That is, the route matching the policy will be suppressed, but other routes that fail the policy will not be suppressed and still be advertised.
C . Origin-policy selects all detailed routes to generate aggregated routes.
D . attribute-policy is used to set the attribute of the detail route.
Answer: ACD
As shown in the figure, on the network running the RSTP protocol, the original root port of the SWC is faulty and the port is in the Down state. In this case, the network goes through which processes to achieve stability?
As shown in the figure, on the network running the RSTP protocol, the original root port of the SWC is faulty and the port is in the Down state. In this case, the network goes through which processes to achieve stability?
A . The prepared port on the SWC becomes the new root port and enters to Forwarding state after passing through the Learning state.
B . The prepared port on the SWC becomes the new root port and enters to Forwarding state directly.
C . SWC newly elects the root port and enters to Forwarding state after learning.
D . SWC newly elects the root port and enters to Forwarding state directly.
Answer: B
About the definition of router roles within or between OSPF areas, which is correct? (Multiple Choice)
About the definition of router roles within or between OSPF areas, which is correct? (Multiple Choice)
A . Internal router: refers to the router whose all interfaces belong to the same area.
B . ABR: A router that connects one or more areas and connects to the backbone area. These routers act as routing gateways for inter-domain communication.
C . Backbone router: refers to a router that has at least two interfaces that belong to the backbone area.
D . ASBR: It can be an internal router, a backbone router, or a regional edge router.
Answer: ABD
The differences between IGMP versions are: (Multiple Choice)
The differences between IGMP versions are: (Multiple Choice)
A . IGMPv1/v2 cannot elect the querier on its own, but IGMPv3 can.
B . For members leaving, IGMPv2/v3 can leave actively, but IGMPv1 cannot.
C . IGMPv1/v2/v3 cannot support the SSM model.
D . IGMPv1 does not support specific group queries but IGMPv2 support.
Answer: BD
As shown in the figure, on the network running the RSTP protocol, the original root port of the SWC is faulty and the port is in the Down state. In this case, the network goes through which processes to achieve stability?
As shown in the figure, on the network running the RSTP protocol, the original root port of the SWC is faulty and the port is in the Down state. In this case, the network goes through which processes to achieve stability?
A . The prepared port on the SWC becomes the new root port and enters to Forwarding state after passing through the Learning state.
B . The prepared port on the SWC becomes the new root port and enters to Forwarding state directly.
C . SWC newly elects the root port and enters to Forwarding state after learning.
D . SWC newly elects the root port and enters to Forwarding state directly.
Answer: B
The following description about OSPF packet authentication, which is wrong?
The following description about OSPF packet authentication, which is wrong?
A . The authentication modes supported by AR2200 are classified into null, simple, MD5 and HMAC-MD5 based on the encryption algorithm.
B . AR2200 supports two authentication modes: area authentication and interface authentication.
C . When both the area authentication mode and the interface authentication mode exist, use area authentication first.
D . Only authenticated OSPF packets are accepted. Otherwise, neighbors cannot be set up normally.
Answer: C
In the network as shown in the figure, all switches run the RSTP protocol. If the E1 interface of SWB failure, the RSTP process is? (Multiple choices)
In the network as shown in the figure, all switches run the RSTP protocol. If the E1 interface of SWB failure, the RSTP process is? (Multiple choices)
A . SWB deletes the port list that use E1 as the destination port in the MAC address table.
B . Recalculate the spanning tree and elect E2 as the new root port.
C . Topology change notification is sent out on all forwarding ports to inform other switch networks that a topology change has occurred.
D . Topology change notification is sent out on all non-edge forwarding ports to inform other switch networks that a topology change has occurred.
Answer: ABD