400-101 Exam Questions - Online Test
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Q1. In which two situations is an EIGRP hello packet sent as unicast? (Choose two.)
A. during neighbor discovery
B. when link costs change
C. when the neighbor command is used
D. when an ACK is sent
Answer: C,D
Q2. Refer to the exhibit.
Which configuration reduces CPU utilization on R2 while still advertising the connected routes of R2 to R1?
A. Configure eigrp stub connected on R2.
B. Configure eigrp stub receive-only on R1.
C. Configure eigrp stub static on R2.
D. Configure eigrp stub summary on R1.
Answer: A
Q3. Which three responses can a remote RADIUS server return to a client? (Choose three.)
A. Reject-Challenge
B. Access-Reject
C. Accept-Confirmed
D. Access-Accept
E. Access-Challenge
F. Reject-Access
Answer: B,D,E
Q4. Refer to the exhibit.
R1, R2, and R3 have full network connectivity to each other, but R2 prefers the path through R3 to reach network 172.17.1.0/24. Which two actions can you take so that R2 prefers the path through R1 to reach 172.17.1.0/24? (Choose two.)
A. Set the reference bandwidth to 10000 on R1, R2, and R3.
B. Configure the cost on the link between R1 and R3 to be greater than 100 Mbps.
C. Set the reference bandwidth on R2 only.
D. Configure a manual bandwidth statement with a value of 1 Gbps on the link between R1 and R3.
E. Modify the cost on the link between R1 and R2 to be greater than 10 Gbps.
F. Configure a manual bandwidth statement with a value of 100 Mbps on the link between R1 and R2.
Answer: A,B
Explanation:
By default, the reference bandwidth used in Cisco routers is 100Mbps, so FastEthernet and above will have a cost of 1, so a gigabit interface and 10GE interface will be equal with a fastethernet. This is not ideal. If we change the reference bandwidth to 100000 then the faster links will be used. Changing the reference bandwidth needs to be done on all routers in the OSPF network. Increasing the cost on the R1-R3 link will also cause the traffic to take the more direct route.
Q5. Which three statements about DMVPN are true? (Choose three.)
A. It facilitates zero-touch configuration for addition of new spokes.
B. It supports dynamically addressed spokes using DHCP.
C. It features automatic IPsec triggering for building an IPsec tunnel.
D. It requires uses of IPsec to build the DMVPN cloud.
E. Spokes can build tunnels to other spokes and exchange traffic directly.
F. It supports server load balancing on the spokes.
Answer: A,C,E
Q6. Refer to the exhibit.
While troubleshooting high CPU utilization of a Cisco Catalyst 4500 Series Switch, you notice the error message that is shown in the exhibit in the log file.
What can be the cause of this issue, and how can it be prevented?
A. The hardware routing table is full. Redistribute from BGP into IGP.
B. The software routing table is full. Redistribute from BGP into IGP.
C. The hardware routing table is full. Reduce the number of routes in the routing table.
D. The software routing table is full. Reduce the number of routes in the routing table.
Answer: C
Explanation:
L3HWFORWADING-2
Error MessageC4K_L3HWFORWARDING-2-FWDCAMFULL:L3 routing table is full.
Switching to software forwarding.
The hardware routing table is full; forwarding takes place in the software instead. The switch performance might be degraded.
Recommended Action: Reduce the size of the routing table. Enter the ip cef command to return to hardware forwarding.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/31sg/system/message/message/emsg.html
Q7. For which kind of MPLS deployment is the next-hop-self all keyword used on a BGP neighbor command?
A. 6VPE
B. MPLS Carrier's carrier
C. inter-AS MPLS VPN option D
D. inter-AS MPLS VPN option C
E. Unified MPLS
Answer: E
Explanation:
Since the core and aggregation parts of the network are integrated and end-to-end LSPs are provided, the Unified MPLS solution is also referred to as "Seamless MPLS." New technologies or protocols are not used here, only MPLS, Label Distribution Protocol (LDP), IGP, and BGP. Since you do not want to distribute the loopback prefixes of the PE routers from one part of the network into another part, you need to carry the prefixes in BGP. The Internal Border Gateway Protocol (iBGP) is used in one network, so the next hop address of the prefixes is the loopback prefixes of the PE routers, which is not known by the IGP in the other parts of the network. This means that the next hop address cannot be used to recurse to an IGP prefix. The trick is to make the ABR routers Route Reflectors (RR) and set the next hop to self, even for the reflected iBGP prefixes. In order for this to work, a new knob is needed. Only the RRs need newer software to support this architecture. Since the RRs advertise the BGP prefixes with the next hop set to themselves, they assign a local MPLS label to the BGP prefixes. This means that in the data plane, the packets forwarded on these end-to-end LSPs have an extra MPLS label in the label stack. The RRs are in the forwarding path. There are two possible scenarios:
. The ABR does not set the next hop to self for the prefixes advertised (reflected by BGP) by the ABR into the aggregation part of the network. Because of this, the ABR needs to redistribute the loopback prefixes of the ABRs from the core IGP into the aggregation IGP. If this is done, there is still scalability. Only the ABR loopback prefixes (from the core) need to be advertised into the aggregation part, not the loopback prefixes from the PE routers from the remote aggregation parts.
. The ABR sets the next hop to self for the prefixes advertised (reflected by BGP) by the ABR into the aggregation part. Because of this, the ABR does not need to redistribute the loopback prefixes of the ABRs from the core IGP into the aggregation IGP.
In both scenarios, the ABR sets the next hop to self for the prefixes advertised (reflected by BGP) by the ABR from the aggregation part of the network into the core part. If this is not done, the ABR needs to redistribute the loopback prefixes of the PEs from the aggregation IGP into the core IGP. If this is done, there is no scalability. In order to set the next hop to self for reflected iBGP routes, you must configure the neighbor x.x.x.x next-hop-self all command.
Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.html
Q8. Which two statements about OSPFv3 are true? (Choose two.)
A. It supports unicast address families for IPv4 and IPv6.
B. It supports unicast address families for IPv6 only.
C. It supports only one address family per instance.
D. It supports the use of a cluster ID for loop prevention.
E. It supports multicast address families for IPv4 and IPv6.
F. It supports multicast address families for IPv6 only.
Answer: A,C
Q9. Which statement about the bgp soft-reconfig-backup command is true?
A. It requires BGP to store all inbound and outbound updates.
B. It overrides soft reconfiguration for devices that support inbound soft reconfiguration.
C. When the peer is unable to store updates, the updates are implemented immediately.
D. It provides soft reconfiguration capabilities for peers that are unable to support route refresh.
E. It provides outbound soft reconfiguration for peers.
Answer: D
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