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2021 Apr 400-101 answers
Q301. DRAG DROP
Drag and drop the NHRP flag on the left to the corresponding meaning on the right.
Answer:
Q302. In which type of EIGRP configuration is EIGRP IPv6 VRF-Lite available?
A. stub
B. named mode
C. classic mode
D. passive
Answer: B
Explanation:
The EIGRP IPv6 VRF Lite feature provides EIGRP IPv6 support for multiple VRFs. EIGRP for IPv6 can operate in the context of a VRF. The EIGRP IPv6 VRF Lite feature provides
separation between routing and forwarding, providing an additional level of security because no communication between devices belonging to different VRFs is allowed unless it is explicitly configured. The EIGRP IPv6 VRF Lite feature simplifies the management and troubleshooting of traffic belonging to a specific VRF. The EIGRP IPv6 VRF Lite feature is available only in EIGRP named configurations.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2mt/ipv6-15-2mt-book/ip6-eigrp.html#GUID-92B4FF4F-2B68-41B0-93C8-AAA4F0EC1B1B
Q303. Refer to the exhibit.
Your organization has two offices, Site 1 and Site 2, which are connected by a provider
backbone, as shown. Where must you configure an attachment circuit to allow the two sites to connect over a Layer 2 network using L2TPv3?
A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0
B. CE Site 1 Fa0/0 and CE Site 2 Fa0/0
C. PE Site 1 Se0/0 and PE Site 2 Se0/0
D. CE Site 1 Fa0/0 and PE Site 2 Se0/0
Answer: A
Q304. Which field is specific to the OPSFv3 packet header, as opposed to the OSPFv2 packet header?
A. checksum
B. router ID
C. AuType
D. instance ID
Answer: D
Explanation:
In OSPFv3, Instance ID is a new field that is used to have multiple OSPF process’ instance per link. By default it is 0 and for any additional instance it is increased, instance ID has local link significance only. OSPFv3 routers will only become neighbors if the instanceIDs match. It is thus possible to have multiple routers on a broadcast domain and all run Ospfv3 but not all of them becoming neighbors.
Reference: https://supportforums.cisco.com/document/97766/comparing-ospfv3-ospfv2-routing-protocol
Q305. Which three statements about GLBP are true? (Choose three.)
A. It uses a virtual MAC address that starts with 0007.b4.
B. It elects a single active virtual gateway to appoint and manage multiple active virtual forwarders.
C. It allows the configured virtual IP address to be used on a physical interface as well.
D. It uses a virtual MAC address that starts with 0070.4b.
E. It elects multiple active virtual gateways to appoint and manage a single active virtual forwarder.
F. Preemption is enabled for the configured active virtual gateway by default.
Answer: A,B,C
Explanation:
The virtual MAC address in GLBP is 0007.b400.xxyy where xx is the GLBP group number and yy is the different number of each gateway (01, 02, 03…). One of the routers in a GLBP group is elected as an AVG – Active Virtual Gateway. There is only one active AVG in a group, and its task is to respond to ARP requests sent to the virtual gateway IP address replying different virtual MAC addresses in response packets. GLBP allows the configured virtual IP address to be used on a physical interface. By default, the GLBP gateway preemptive scheme is disabled. A backup virtual gateway can become the AVG only if the current AVG fails, regardless of the priorities assigned to the virtual gateways.
Updated 400-101 rapidshare:
Q306. Which statement about a P router in a Layer 3 MPLS VPN is true?
A. It is unaware of VPN routes.
B. It connects to customer edge routers.
C. It participates in MPLS VPN routing.
D. It uses the running IGP to share VPN routes.
Answer: A
Q307. Which statement is true about MLD?
A. MLD v1 gives hosts the ability to receive multicast packets from specific source addresses.
B. All MLD messages are sent with a link-local IPv6 source address of FF02::D.
C. The multicast address field is cleared to zero when sending an MLD report message.
D. MLD is used by IPv6 routers to discover multicast listeners on a directly attached link.
Answer: D
Explanation:
IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast packets destined for specific multicast addresses) on directly attached links. There are two versions of MLD. MLD version 1 is based on version 2 of the IGMP for IPv4, and MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for Cisco software uses both MLD version 2 and MLD version 1.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe-3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html
Q308. Which two statements about VPLS are true? (Choose two.)
A. Split horizon is used on PE devices to prevent loops.
B. Spanning tree is extended from CE to CE.
C. IP is used to switch Ethernet frames between sites.
D. PE routers dynamically associate to peers.
E. VPLS extends a Layer 2 broadcast domain.
Answer: A,E
Q309. Which two hashing algorithms can be used when configuring SNMPv3? (Choose two.)
A. MD5
B. SHA-1
C. Blowfish
D. DES
E. AES
F. SSL
Answer: A,B
Explanation:
Note that SNMPv3 does not send passwords in clear-text and uses hash-based authentication with either MD5 or SHA1 functions (HMAC authentication – the packet conted is hashed along with authentication key to produce the authentication string).
Reference: http://blog.ine.com/2008/07/19/snmpv3-tutorial/
Q310. With which ISs will an IS-IS Level 1 IS exchange routing information?
A. Level 1 ISs
B. Level 1 ISs in the same area
C. Level 1 and Level 2 ISs
D. Level 2 ISs
Answer: B
Explanation:
IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Level 2 routers are inter area routers that can only form relationships with other Level 2 routers. Routing information is exchanged between Level 1 routers and other Level 1 routers, and Level 2 routers only exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.
Reference: http://en.wikipedia.org/wiki/IS-IS