Which of the following statements regarding OSPF route summarization commands are true?

The asbr-summary command is executed in the OSPF view.

The abr-summary command is executed in the OSPF area view.

Advertise is the default parameter of the abr-summary command. That is, if not-advertise is not specified in the abr-summary command, the advertise parameter takes effect by default.

The asbr-summary command is executed in the OSPF view.

The abr-summary command is executed in the OSPF area view.

Advertise is the default parameter of the abr-summary command. That is, if not-advertise is not specified in the abr-summary command, the advertise parameter takes effect by default.

Not-advertise is the default parameter of the abr-summary command. That is, if advertise is not specified in the abr-summary command, the not-advertise parameter takes effect by default.

See the command output of a router below. Which of the following statements is true?<R2>display ospf interface GigabitEthernet 0/0/0 verboseOSPF Process 1 with Router ID 10.0.2.2Interface: 10.0.12.2 (GigabitEthernet 0/0/0)Cost: 1 State: BDR Type: Broadcast MTU: 1500Priority: 1Designated Router: 10.0.12.1Backup Designated Router: 10.0.12.2Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1

The interface IP address is 10.1.12.1.

Which of the following statements regarding OSPF is true?

OSPF performs LSDB update every 30 minutes.

OSPF does not have an acknowledgement mechanism. Therefore, OSPF relies on the upper-layer protocol, TCP, for acknowledgement.

OSPF performs LSDB update every 30 minutes.

OSPF uses the Bellman-Ford algorithm, and each router independently runs this algorithm.

OSPF floods a LSU packet at an interval of 5s.

Which of the following statements regarding the OSPF protocol is false?

Link State ID in a Type 3 LSA indicates the router ID of an ABR.

Each OSPF router uses only one Router-LSA to describe the local active connection status of an area.

Routing information can be advertised only between backbone and non-backbone areas and cannot be advertised directly between non-backbone areas.

Router-LSA describes four connection types: P2P, TransNet, SubNet, and virtual link.

Link State ID in a Type 3 LSA indicates the router ID of an ABR.

This configuration is part of RTA configuration. Which of the following statements regarding the configuration are true?[RTA] ospf 100[RTA-ospf-100]silent-interface GigabitEthernet 1/0/0

RTA cannot establish a neighbor relationship with the neighbor that this interface is directly connected to.

GigabitEthernet 1/0/0 is prohibited from sending OSPF packets.

This interface cannot send Hello packets.

RTA cannot establish a neighbor relationship with the neighbor that this interface is directly connected to.

GigabitEthernet 1/0/0 is prohibited from sending OSPF packets.

Direct routes of GigabitEthernet 1/0/0 can still be advertised.

This interface cannot send Hello packets.

Which of the following statements regarding OSPF multi-instance is false?

The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers.

Route exchange between different OSPF processes is similar to route exchange between different routing protocols.

An interface of a router belongs to only a certain OSPF process.

The OSPF process IDs must be the same when OSPF neighbor relationships are established between different routers.

Multiple OSPF processes can run on the same router, and they are independent of each other.

Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. R1 and R2 are connected through a PPP link, and R3 is the DIS. Which of the following statements are true?

R3 periodically sends CSNPs to implement Level-2 LSDB synchronization.

If R1 sends an LSP, R2 needs to send a PSNP for acknowledgment.

If R2 sends a Level-2 LSP, R3 needs to send a PSNP for acknowledgment.

R3 periodically sends CSNPs to implement Level-2 LSDB synchronization.

R2 sends an LSP to R3 and R4 in unicast mode.

If R1 sends an LSP, R2 needs to send a PSNP for acknowledgment.

Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. Which of the following statements is true?

The LSDB of R1 does not contain the LSP of R4.

The LSDB of R2 does not contain the LSP of R4.

The LSDB of R1 does not contain the LSP of R4.

The LSDB of R2 does not contain the LSP of R3.

The LSDB of R3 does not contain the LSP of R4.

See the network shown in the following figure. R1 and R2 run IS-IS and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2. Which of the following statements are true?

The routing table of R1 does not contain the route 10.0.2.3/32.

The routing table of R1 contains the route 10.0.2.2/32.

The routing table of R1 contains the route 10.0.2.3/32.

The routing table of R1 does not contain the route 10.0.2.3/32.

The routing table of R1 does not contain the routes 10.0.2.2/32 and 10.0.2.3/32.

The routing table of R1 contains the route 10.0.2.2/32.

Which of the following statements regarding the BGP error display of a router is false?

The error occurred at 11:40:39 on March 22, 2010.

The neighbor address of this router is 10.1.1.2.

The error may be caused by the incorrect peer AS number.

Error Type indicates that the BGP error is caused by the neighbor relationship error.

Which of the following statements regarding the display bgp routing-table command output is true?

The route to the destination address 192.168.1.0 is injected into the BGP routing table using the network command.

The route to the destination address 192.168.1.0 is learned through AS 200.

The MED value of the route to the destination address 192.168.1.0 is 100.

The route to the destination address 192.168.1.0 is not the optimal route in the BGP routing table.

The route to the destination address 192.168.1.0 is injected into the BGP routing table using the network command.

Which of the following statements regarding the MED value in BGP are true?

According to BGP route selection rules, the MED value has a lower priority than AS_Path, Preferred-Value, Local-Preference, and Origin.

By default, if there is no MED value in routes, the value 0 is used. If the bestroute med-none-as-maximum command is configured, the maximum MED value 4294967295 is used.

According to BGP route selection rules, the MED value has a lower priority than AS_Path, Preferred-Value, Local-Preference, and Origin.

The default MED value of BGP routes is 0.

By default, BGP can compare the MED values of routes from different ASs.

By default, if there is no MED value in routes, the value 0 is used. If the bestroute med-none-as-maximum command is configured, the maximum MED value 4294967295 is used.

Which of the following statements regarding Local-Preference in BGP is true?

The default Local-Preference value is 100.

Local-Preference affects traffic that enters an AS.

Local-Preference can be transmitted between ASs.

The default Local-Preference value is 100.

Local-Preference is a well-known mandatory attribute.

Which of the following scenarios is not suitable for deploying interface PBR?

A device needs to modify the next-hop IP address for locally originated traffic.

A core switch needs to forward traffic between the intranet and extranet to an AC device that connects to the core switch in off-path mode.

A core switch needs to forward the traffic between the intranet and extranet to a security detection device that connects to the core switch in off-path mode.

A device needs to modify the next-hop IP address for locally originated traffic.

On an enterprise network with multiple ISP outbound interfaces, each internal network segment accesses the Internet through a particular ISP outbound interface.

A route-policy can have multiple nodes, and each node can have multiple if-match and apply clauses. Which of the following statements are false?

The operator between nodes is AND.

The operator between if-match clauses under a node is OR.

The operator between if-match clauses under a node is AND.

The operator between nodes is AND.

The operator between if-match clauses under a node is OR.

The operator between nodes is OR.

Which of the following statements regarding routing policy and policy-based routing are true?

A routing policy is used to control import, advertisement, and receiving of routing information.

Policy-based routing is used to control packet forwarding without following routes in the routing table.

A routing policy is used to control import, advertisement, and receiving of routing information.

Policy-based routing is used to control import, advertisement, and receiving of routing information.

Policy-based routing is used to control packet forwarding without following routes in the routing table.

A routing policy is used to control packet forwarding without following routes in the routing table.

STP ensures a loop-free network but has a slow network topology convergence speed, affecting communication quality. RSTP has made some improvements based on STP. Which of the following improvements is not included?

If a port does not receive configuration BPDUs from the upstream device within four Hello intervals, the switch considers that the negotiation with the neighbor fails.

The non-root switch running RSTP sends configuration BPDUs at the interval specified by the Hello timer, which is performed independently by each device.

RSTP reduces five port states to three port states based on user traffic forwarding and MAC address learning.

RSTP deletes three port states and adds two port roles.

On a network, some switches are enabled with RSTP and some switches are enabled with STP. What will happen?

A Huawei switch changes from RSTP to STP. After the STP-enabled switch is removed from the network, the RSTP-enabled switch can be moved back to the RSTP mode.

STP and RSTP are compatible with each other, but the rapid convergence of RSTP is unavailable.

A Huawei switch changes from RSTP to STP. After the STP-enabled switch is removed from the network, the RSTP-enabled switch can be moved back to the RSTP mode.

A Huawei switch changes its mode from STP to RSTP. After the RSTP-enabled switch is removed from the network, the STP-enabled switch can be moved back to the RSTP mode.

STP and RSTP are compatible with each other, but the rapid convergence of RSTP is unavailable.

STP and RSTP calculation are performed independently.

Which of the following statements about stack split is false?

After a stack splits, the MAC addresses of the two stacks change immediately.

If the master and standby switches are still in the same stack after the stack splits, the slave switches separated from the original master and standby switches re-elect the master and standby switches due to protocol packet timeout.

If the master and standby switches are in two stacks after the split, the stack where the original master switch resides updates the topology and selects a new standby switch. The original standby switch becomes the master switch in the new stack and a new standby switch is elected.

After a stack splits, multiple stacks have the same IP address and MAC address. To prevent network faults, the stacks perform MAD detection. The stack that fails the MAD detection shuts down all physical ports except reserved ports.

Which of the following statements regarding multicast MAC addresses are false?

One multicast MAC address maps to only one multicast IP address.

One multicast MAC address maps to 32 multicast IP addresses.

One multicast MAC address maps to only one multicast IP address.

The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.

A multicast MAC address identifies receivers of a multicast group on the data link layer.

A firewall receives a packet that PC1 sends to PC2. Which of the following statements are true?

The packet matches security policy rule 1, and the firewall forwards the packet.

The packet does not match any security policy.

The packet matches security policy rule 1, and the firewall forwards the packet.

No source or destination security zone is specified in security policy rule 2, indicating that any security zone is a match.

The packet matches security policy rule 1, and the firewall discards the packet.

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