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2021 Mar 400-101 pdf exam
Q461. When deploying redundant route reflectors in BGP, which attribute can you configure on the route reflector to allow routes to be identified as belonging to the same group?
A. ROUTER_ID
B. CLUSTER_ID
C. ORIGINATOR_ID
D. PEER_GROUP
Answer: B
Explanation:
Together, a route reflector and its clients form a cluster. When a single route reflector is deployed in a cluster, the cluster is identified by the router ID of the route reflector. The bgp cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables.
Reference: http://ieoc.com/forums/t/5326.aspx
Q462. 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
Q463. Refer to the exhibit.
How many LSDBs will router A have?
A. 0
B. 1
C. 2
D. 3
Answer: D
Q464. What is the main component of Unified MPLS?
A. Multiple IGPs in the network are used, where the loopback IP addresses of the PE routers are aggregated on the area border routers.
B. Confederations are used to provide scalability.
C. The loopback prefixes from one IGP area are redistributed into BGP without changing the next hop.
D. The ABR is a BGP route reflector and sets next-hop to self for all reflected routes.
Answer: D
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.
Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.html
Q465. Refer to the exhibit.
What is wrong with the configuration of this tunnel interface?
A. ISATAP tunnels cannot use the EUI-64 address format.
B. No tunnel destination has been specified.
C. The tunnel source of an ISATAP tunnel must always point to a loopback interface.
D. Router advertisements are disabled on this tunnel interface.
Answer: D
Explanation:
Sending of IPv6 router advertisements is disabled by default on tunnel interfaces. This command reenables the sending of IPv6 router advertisements to allow client autoconfiguration:
Example: Router(config-if)# no ipv6 nd ra suppress
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-isatap-xe.html
Far out 400-101 simulations:
Q466. Which three statements about implementing a NAT application layer gateway in a network are true? (Choose three.)
A. It allows client applications to use dynamic ports to communicate with a server regardless of whether NAT is being used.
B. It maintains granular security over application-specific data.
C. It allows synchronization between multiple streams of data between two hosts.
D. Application layer gateway is used only in VoIP/SIP deployments.
E. Client applications require additional configuration to use an application layer gateway.
F. An application layer gateway inspects only the first 64 bytes of a packet before forwarding it through the network.
Answer: A,B,C
Explanation:
An application-level gateway (ALG), also known as an application-layer gateway, is an application that translates the IP address information inside the payload of an application packet. An ALG is used to interpret the application-layer protocol and perform firewall and Network Address Translation (NAT) actions. These actions can be one or more of the following depending on your configuration of the firewall and NAT:
. Allow client applications to use dynamic TCP or UDP ports to communicate with the server application.
. Recognize application-specific commands and offer granular security control over them.
. Synchronize multiple streams or sessions of data between two hosts that are exchanging data.
. Translate the network-layer address information that is available in the application payload
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/asr1000/nat-xe-3s-asr1k-book/fw-msrpc-supp.html
Q467. Which regular expression will match prefixes from the AS 200 that is directly connected to our AS?
A. ^$
B. ^200)
C. _200$
D. _200_
E. ^200_
Answer: E
Explanation:
Table 2
Commonly Used Regular Expressions
Expression
Meaning
*
Anything
^$
Locally originated routes
^100_
Learned from autonomous system 100
_100$
Originated in autonomous system 100
_100_
Any instance of autonomous system 100
^[0-9]+$
Directly connected autonomous system paths
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_bo ok/tsv_reg_express.html
Q468. Which statement about passive interfaces is true?
A. The interface with the OSPF passive interface configuration appears as a not-so-stubby network.
B. The interface with the EIGRP passive interface configuration ignores routes after the exchange of hello packets.
C. The interface with the IS-IS passive interface configuration sends the IP address of that interface in the link-state protocol data units.
D. Passive interface can be configured on the interface for IS-IS.
Answer: C
Explanation:
With IS-IS, passive interfaces are used to prevent unnecessary LSA packets out that interface, but the IP address of passive interfaces are still included in updates going out the other interfaces. This behavior is what enables the best practice of configuring loopback interfaces as passive, but still having the loopback be reachable.
Q469. Which two statements about logging are true? (Choose two.)
A. Log messages are sent to the console port by default.
B. Log messages are displayed in a Telnet session by default.
C. Interface status changes are logged at the Notification level.
D. Interface status changes are logged at the Informational level.
E. System restart messages are logged at the Critical level.
F. Reload requests are logged at the Notification level.
Answer: A,C
Explanation:
By default, switches send the output from system messages and debug privileged EXEC commands to a logging process. The logging process controls the distribution of logging messages to various destinations, such as the logging buffer, terminal lines, or a UNIX syslog server, depending on your configuration. The process also sends messages to the console.
Table 29-3 Message Logging Level Keywords
Level Keyword
Level
Description
Syslog Definition
emergencies
0
System unstable
LOG_EMERG
alerts
1
Immediate action needed
LOG_ALERT
critical
2
Critical conditions
LOG_CRIT
errors
3
Error conditions
LOG_ERR
warnings
4
Warning conditions
LOG_WARNING
notifications
5
Normal but significant condition
LOG_NOTICE
informational
6
Informational messages only
LOG_INFO
debugging
7
Debugging messages
LOG_DEBUG
The software generates four other categories of messages:
. Error messages about software or hardware malfunctions, displayed at levels warnings through emergencies. These types of messages mean that the functionality of the switch is affected. For information on how to recover from these malfunctions, see the system message guide for this release.
. Output from the debug commands, displayed at the debugging level. Debug commands are typically used only by the Technical Assistance Center.
Interface up or down transitions and system restart messages, displayed at the notifications level. This message is only for information; switch functionality is not affected.
. Reload requests and low-process stack messages, displayed at the informational level. This message is only for information; switch functionality is not affected.
References: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-
1_9_ea1/configuration/guide/scg/swlog.html
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swlog.html
Q470. Which statement is true about IGMP?
A. Multicast sources send IGMP messages to their first-hop router, which then generates a PIM join message that is then sent to the RP.
B. Multicast receivers send IGMP messages to their first-hop router, which then forwards the IGMP messages to the RP.
C. IGMP messages are encapsulated in PIM register messages and sent to the RP.
D. Multicast receivers send IGMP messages to signal their interest to receive traffic for specific multicast groups.
Answer: D
Explanation:
In the example shown above, the receivers (the designated multicast group) are interested in receiving the video data stream from the source. The receivers indicate their interest by sending an Internet Group Management Protocol (IGMP) host report to the routers in the network. The routers are then responsible for delivering the data from the source to the receivers.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_o vr.html