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2021 Mar 400-101 free question
Q211. Which data plane protocol does EIGRP Over the Top use?
A. MPLS
B. GRE
C. LISP
D. IP-in-IP
Answer: C
Explanation:
The EIGRP Over the Top solution can be used to ensure connectivity between disparate Enhanced Interior Gateway Routing Protocol (EIGRP) sites. This feature uses EIGRP on the control plane and Locator ID Separation Protocol (LISP) encapsulation on the data plane to route traffic across the underlying WAN architecture. EIGRP is used to distribute routes between customer edge (CE) devices within the network, and the traffic forwarded across the WAN architecture is LISP encapsulated. Therefore, to connect disparate EIGRP sites, you must configure the neighbor command with LISP encapsulation on every CE in the network.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-xe-3s-book/ire-eigrp-over-the-top.html
Q212. Refer to the exhibit.
Which log levels are enabled for the console?
A. informational only
B. informational and debugging
C. informational, debugging, notifications, warnings, errors, critical, alerts, and emergencies
D. informational, notifications, warnings, errors, critical, alerts, and emergencies
Answer: D
Q213. Which two statements about EIGRP load balancing are true? (Choose two.)
A. EIGRP supports 6 unequal-cost paths.
B. A path can be used for load balancing only if it is a feasible successor.
C. EIGRP supports unequal-cost paths by default.
D. Any path in the EIGRP topology table can be used for unequal-cost load balancing.
E. Cisco Express Forwarding is required to load-balance across interfaces.
Answer: A,B
Q214. Which two statements about MLD are true? (Choose two.)
A. MLD is a subprotocol of ICMPv6.
B. When a single link supports multiple interfaces, only one interface is required to send MLD messages.
C. MLD is a subprotocol of PIMv6.
D. When a single link supports multiple interfaces, all supported interfaces are required to send MLD messages.
E. There are three subtypes of MLD query messages.
F. The code section in the MLD message is set to 1 by the sender and ignored by receivers.
Answer: A,B
Q215. Refer to the exhibit.
ICMP Echo requests from host A are not reaching the intended destination on host B. What is the problem?
A. The ICMP payload is malformed.
B. The ICMP Identifier (BE) is invalid.
C. The negotiation of the connection failed.
D. The packet is dropped at the next hop.
E. The link is congested.
Answer: D
Explanation:
Here we see that the Time to Live (TTL) value of the packet is one, so it will be forwarded to the next hop router, but then dropped because the TTL value will be 0 at the next hop.
Rebirth 400-101 exam answers:
Q216. Which Cisco IOS XE process administers routing and forwarding?
A. Forwarding manager
B. Interface manager
C. Cisco IOS
D. Host manager
Answer: C
Explanation:
Some of the processes are listed in the table below:
Process
Purpose
Affected FRUs
SubPackage Mapping
Host Manager
Provides an interface between the IOS process and many of the information-gathering functions of the underlying platform kernel and operating system.
RP (one instance per RP)
SIP (one instance per SIP)
ESP (one instance per ESP)
RPControl
SIPBase
ESPBase
Interface Manager
Provides an interface between the IOS process and the per-SPA interface processes on the SIP.
RP (one instance per RP)
SIP (one instance per SIP)
RPControl
SIPBase
IOS
The IOS process implements all forwarding and routing features for the router.
RP (one per software redundancy instance per RP). Maximum of two instances per RP.
RPIOS
Forwarding Manager
Manages the downloading of configuration to each of the ESPs and the communication of forwarding plane information, such as statistics, to the IOS process.
RP (one per software redundancy instance per RP). Maximum of two instances per RP.
ESP (one per ESP)
RPControl
ESPBase
Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/asrswcfg /Software_Packaging_Architecture.html
Q217. Which technology is an application of MSDP, and provides load balancing and redundancy between the RPs?
A. static RP
B. PIM BSR
C. auto RP
D. anycast RP
Answer: D
Explanation:
Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.
Reference: www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html
Q218. Refer to the exhibit.
Which statement is true about the downward bit?
A. It forces the CE router to use a backup link instead of sending traffic via MPLS VPN.
B. It informs the PE router that the LSA metric has been recently decreased to 1 and that partial SPF calculation cannot be delayed.
C. It forces the CE router to install the LSA with the downward bit set into its routing table as a discard route.
D. It informs the PE router that the LSA was already redistributed into BGP by another PE router and that the LSA must not be redistributed into BGP again.
Answer: D
Explanation:
From RFC 4577, specifically section 4.2.5.1
When a type 3 LSA is sent from a PE router to a CE router, the DN bit [OSPF-DN] in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LSA to a PE router, the PE router will not redistribute it further.
When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.
Q219. Refer to the exhibit.
You must complete the configuration on R1 so that a maximum of three links can be used and fragmentation is supported.
Which additional configuration accomplishes this task?
A. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links minimum 1
ppp multilink links maximum 3
ppp multilink interleave
B. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink fragment delay 20
C. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink fragment delay 20
ppp multilink interleave
D. interface Multilink19
ip address 192.168.1.1 255.255.255.252
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink interleave
Answer: A
Explanation:
The “ppp multilink interleave” command is needed to enable link fragmentation and Interleaving (LFI). The Cisco IOS Link Fragmentation and Interleaving (LFI) feature uses Multilink PPP (MLP). MLP provides a method of splitting, recombining, and sequencing datagrams across multiple logical data links. MLP allows packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the same remote address.
ppp multilink links maximum
To limit the maximum number of links that Multilink PPP (MLP) can dial for dynamic allocation, use the ppp multilink links maximum command in interface configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcflfi.html
Q220. DRAG DROP
Drag and drop the events on the left to dispaly the correct sequence on the right when CoPP is enabled.
Answer: