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2021 Feb ccie dumps 400-101:
Q141. Refer to the exhibit.
Which statement about this device configuration is true?
A. The NMS needs a specific route configured to enable it to reach the Loopback0 interface of the device.
B. The ifindex of the device could be different when the device is reloaded.
C. The device will allow anyone to poll it via the public community.
D. The device configuration requires the AuthNoPriv security level.
Answer: B
Explanation:
One of the most commonly used identifiers in SNMP-based network management applications is the Interface Index (ifIndex) value. IfIndex is a unique identifying number associated with a physical or logical interface. For most software, the ifIndex is the name of the interface. Although relevant RFCs do not require that the correspondence between particular ifIndex values and their interfaces be maintained across reboots, applications such as device inventory, billing, and fault detection depend on this correspondence. Consider a situation where a simple monitoring software (like MRTG) is polling the interface statistics of the router specific serial interface going to the internet.
As an example, you could have these conditions prior to re-initialization:
physical port ifIndex
ethernet port
tokenring port
2
serial port
3
Therefore, the management application is polling the ifIndex 3, which corresponds to the serial port.
After the router re-initialization (reboot, reload and so on) the conditions change to something similar to this:
physical port
ifIndex
ethernet port
3
tokenring port
1
serial port
2
The management application continues polling the ifIndex 3, which corresponds now to the ethernet port. Therefore, if the management application is not warned by a trap, for example, that the router has been rebooted, the statistics polled could be completely wrong.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/28420-ifIndex-Persistence.html
Q142. Which two statements about redistribution are true? (Choose two.)
A. When BGP traffic is redistributed into OSPF, the metric is set to 1 unless the metric is defined.
B. When EIGRP routes on a CE are redistributed through a PE into BGP, the Cost Community POI is set automatically.
C. When OSPF traffic is redistributed into BGP, internal and external routes are redistributed.
D. When BGP traffic is redistributed into OSPF, eBGP and iBGP routes are advertised.
E. iBGP routes automatically redistribute into the IGP if the routes are in the routing table.
F. When EIGRP traffic is redistributed into BGP, a default metric is required.
Answer: A,B
Q143. What is the range of addresses that is used for IPv4-mapped IPv6 addresses?
A. 2001. db9. . /32
B. 2001. db8. . /32
C. 2002. . /16
D. . . ffff. /16
E. . . ffff. 0. 0/96
Answer: E
Explanation:
IPv4-Mapped Addresses FFFF:0:0/96 are the IPv4-mapped addresses [RFC4291]. Addresses within this block should not appear on the public Internet.
Reference: https://tools.ietf.org/html/rfc5156
Q144. Which two options are mandatory components of a multiprotocol BGP VPN-IPv4 address? (Choose two.)
A. a route distinguisher
B. an IPv4 address
C. a route target
D. an MPLS label
E. a system ID
F. an area ID
Answer: A,B
Explanation:
The IP prefix is a member of the IPv4 address family. After the PE device learns the IP prefix, the PE converts it into a VPN-IPv4 prefix by combining it with an 8-byte route distinguisher (RD). The generated prefix is a member of the VPN-IPv4 address family. It uniquely identifies the customer address, even if the customer site is using globally nonunique (unregistered private) IP addresses. The route distinguisher used to generate the VPN-IPv4 prefix is specified by a configuration command associated with the virtual routing and forwarding (VRF) instance on the PE device.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/15-mt/mp-l3-vpns-15-mt-book/mp-bgp-mpls-vpn.html
Q145. On an MPLS L3VPN, which two tasks are performed by the PE router? (Choose two.)
A. It exchanges VPNv4 routes with other PE routers.
B. It typically exchanges iBGP routing updates with the CE device.
C. It distributes labels and forwards labeled packets.
D. It exchanges VPNv4 routes with CE devices.
E. It forwards labeled packets between CE devices.
Answer: A,C
Explanation:
MPLS VPN functionality is enabled at the edge of an MPLS network. The PE router performs these tasks: .
Exchanges routing updates with the CE router .
Translates the CE routing information into VPN version 4 (VPNv4) routes .
Exchanges VPNv4 routes with other PE routers through the Multiprotocol Border Gateway Protocol (MP-BGP)
A PE router binds a label to each customer prefix learned from a CE router and includes the label in the network reachability information for the prefix that it advertises to other PE routers. When a PE router forwards a packet received from a CE router across the provider network, it labels the packet with the label learned from the destination PE router. When the destination PE router receives the labeled packet, it pops the label and uses it to direct the packet to the correct CE router. Label forwarding across the provider backbone is based on either dynamic label switching or traffic engineered paths. A customer data packet carries two levels of labels when traversing the backbone
Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-2/lxvpn/configuration/guide/vcasr9kv342/vcasr9k42v3.html
Far out ccie written exam:
Q146. 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
Q147. Refer to the exhibit.
Which statement is true about a valid IPv6 address that can be configured on tunnel interface0?
A. There is not enough information to calculate the IPv6 address.
B. 6to4 tunneling allows you to use any IPv6 address.
C. 2001:7DCB:5901::/128 is a valid IPv6 address.
D. 2002:7DCB:5901::/128 is a valid IPv6 address.
Answer: D
Explanation:
Most IPv6 networks use autoconfiguration, which requires the last 64 bits for the host. The first 64 bits are the IPv6 prefix. The first 16 bits of the prefix are always 2002:, the next 32 bits are the IPv4 address, and the last 16 bits of the prefix are available for addressing multiple IPv6 subnets behind the same 6to4 router. Since the IPv6 hosts using autoconfiguration already have determined the unique 64 bit host portion of their address, they must simply wait for a Router Advertisement indicating the first 64 bits of prefix to have a complete IPv6 address. A 6to4 router will know to send an encapsulated packet directly over IPv4 if the first 16 bits are 2002, using the next 32 as the destination, or otherwise send the packet to a well-known relay server, which has access to native IPv6.
Reference: http://en.wikipedia.org/wiki/6to4
Q148. Which technology can be affected when switches are used that do not support jumbo frames?
A. 802.1x
B. BFD
C. OSPFv3
D. 802.1q
Answer: D
Explanation:
The 802.1Q tag is 4 bytes. Therefore, the resulting Ethernet frame can be as large as 1522 bytes. If jumbo frames are not supported, then typically the MTU on an Ethernet link needs to be lowered to 1496 to support this extra 802.1Q tag.
Q149. RIPv2 is enabled on a router interface. The "neighbor" command is also configured with a specific IP address. Which statement describes the effect of this configuration?
A. RIP stops sending multicast packets on that interface.
B. RIP starts sending only unicast packets on that interface.
C. RIP starts ignoring multicast packets on that interface.
D. RIP starts sending unicast packets to the specified neighbor, in addition to multicast packets.
Answer: D
Q150. What are the three primary components of NetFlow? (Choose three.)
A. Flow caching
B. A flow collector
C. The data analyzer
D. Flow sequence numbers
E. Cisco Express Forwarding
F. Multicast
Answer: A,B,C
Explanation:
NetFlow includes three key components that perform the following capabilities:
. Flow caching analyzes and collects IP data flows entering router or switch interfaces and prepares data for export. It enables the accumulation of data on flows with unique characteristics, such as IP addresses, application, and CoS.
. FlowCollector and Data Analysis captures exported data from multiple routers and filters and aggregates the data according to customer policies, and then stores this summarized or aggregated data. Users can leverage Cisco NetFlow collector as a flow collector, or they can opt for a variety of third-party partner products. A Graphical user interface displays and analyzes NetFlow data collected from FlowCollector files. This allows users to complete near-real-time visualization or trending analysis of recorded and aggregated flow data. Users can specify the router and aggregation scheme and desired time interval.
Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/product_data_sheet0900aecd80173f71.html