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2021 Apr 400-101 actual test
Q421. Which two statements about the metric-style wide statement as it applies to route redistribution are true? (Choose two.)
A. It is used in IS-IS.
B. It is used in OSPF.
C. It is used in EIGRP.
D. It is used for accepting TLV.
E. It is used in PIM for accepting mroutes.
F. It is used for accepting external routes.
Answer: A,D
Explanation:
To configure a router running IS-IS to generate and accept only new-style TLVs (TLV stands for type, length, and value object), use the metric-style wide command.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/TE_1208S.html#wp49409
Q422. Which option is the default number of routes over which EIGRP can load balance?
A. 1
B. 4
C. 8
D. 16
Answer: B
Explanation:
By default, EIGRP load-shares over four equal-cost paths. For load sharing to happen, the routes to load-share over must show up in the IP forwarding table or with the show ip route command. Only when a route shows up in the forwarding table with multiple paths to it will load sharing occur.
Reference: http://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_I&seqNum=126
Q423. Which statement about a type 4 LSA in OSPF is true?
A. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ASBR.
B. It is an LSA that is originated by an ASBR, that is flooded throughout the AS, and that describes a route to the ASBR.
C. It is an LSA that is originated by an ASBR, that is flooded throughout the area, and that describes a route to the ASBR.
D. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ABR.
E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR.
Answer: E
Explanation:
LSA Type 4 (called Summary ASBR LSA) is generated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to external routes through that ASBR.
Q424. How does having an EIGRP feasible successor speed up convergence?
A. EIGRP sends queries only if there is a feasible successor, which decreases the number of routers that are involved in convergence.
B. EIGRP sends queries only if there is not a feasible successor, which causes less control traffic to compete with data.
C. EIGRP immediately installs the loop-free alternative path in the RIB.
D. EIGRP preinstalls the feasible successor in the RIB in all cases, which causes traffic to switch more quickly.
Answer: C
Explanation:
Feasible Successor
. A next-hop router that serves as backup to the current successor.
. The condition is that the said router’s AD (or RD) is less than the FD of the current successor route.
. Once the feasible successor is selected, they are placed in the topology table. If a change in topology occurs which requires a new route, DUAL looks for the feasible successor and uses it as new route immediately, resulting in fast convergence.
Reference: http://routemyworld.com/2008/07/page/2/
Q425. Which two statements about ERSPAN are true? (Choose two.)
A. It supports jumbo frames of up to 9202 bytes.
B. It adds a 50-byte header to copied Layer 2 Ethernet frames.
C. It supports packet fragmentation and reassembles the packets.
D. It adds a 4-byte header to copied Layer 2 Ethernet frames.
E. Source sessions on an individual switch can use different origin IP addresses.
Answer: A,B
Renewal 400-101 free practice test:
Q426. Which three routing protocols utilize TLVs? (Choose three.)
A. BGP
B. IS-IS
C. ODR
D. OSPF
E. EIGRP
F. RIP
Answer: A,B,E
Explanation:
IS-IS, originally designed for Open System Interconnection (OSI) routing, uses TLV parameters to carry information in Link State Packets (LSPs). The TLVs make IS-IS extendable. IS-IS can therefore carry different kinds of information in the LSPs. Several routing protocols use TLVs to carry a variety of attributes. Cisco Discovery Protocol (CDP), Label Discovery Protocol (LDP), and Border Gateway Protocol (BGP) are examples of protocols that use TLVs. BGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local pReference: The IP header of the EIGRP packet specifies IP protocol number 88 within it, and the maximum length of the packet will be the IP MTU of the interface on which it is transmitted, most of the time 1500 octets. Following the IP header is the various Type/Length/Value (TLV) triplets. These TLVs will not only carry the route entries but also provide fields for the management of the DUAL process, multicast sequencing, and IOS software versions from the router.
References: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/5739-tlvs-5739.html http://ericleahy.com/index.php/eigrp-packets-neighborships/
Q427. Refer to the exhibit.
Which LISP component do routers in the public IP network use to forward traffic between the two networks?
A. EID
B. RLOC
C. map server
D. map resolver
Answer: B
Explanation:
Locator ID Separation Protocol (LISP) is a network architecture and protocol that implements the use of two namespaces instead of a single IP address:
. Endpoint identifiers (EIDs)—assigned to end hosts.
. Routing locators (RLOCs)—assigned to devices (primarily routers) that make up the global routing system. The public networks use the RLOC to forward traffic between networks.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/15-mt/irl-15-mt-book/irl-overview.html
Q428. Which two methods can you use to limit the range for EIGRP queries? (Choose two.)
A. Use an access list to deny the multicast address 224.0.0.1 outbound from select EIGRP neighbor and permit everything else.
B. Configure route tagging for all EIGRP routes.
C. Summarize routes at the boundary routers of the EIGRP domain.
D. Configure unicast EIGRP on all routers in the EIGRP domain.
E. Configure stub routers in the EIGRP domain.
F. Use an access list to deny the multicast address 224.0.0.10 outbound from select EIGRP neighbors and permit everything else.
Answer: C,E
Q429. Which three options are three of the default EIGRP administrative distances? (Choose three.)
A. Internal, 90
B. External, 170
C. Summary, 5
D. Outside Local, 100
E. Inside Local, 180
F. Inside Global, 1
Answer: A,B,C
Explanation:
The following table lists the default administrative distances for various routing protocols used on Cisco routers.
Routing Protocol
Administrative distance
Directly connected interface
0
Static route out an interface
1
Static route to next-hop address
1
DMNR - Dynamic Mobile Network Routing
3
EIGRP summary route
5
External BGP
20
Internal EIGRP
90
IGRP
100
OSPF
110
IS-IS
115
Routing Information Protocol (RIP)
120
Exterior Gateway Protocol (EGP)
140
On Demand Routing (ODR)
160
External EIGRP
170
Internal BGP
200
Floating Static Route (ex. DHCP-learned)
254
Unknown
255
Reference: http://en.wikipedia.org/wiki/Administrative_distance
Q430. Which two statements about Metro Ethernet services are true? (Choose two.)
A. EPL is a point-to-point service from one customer site to another across an MPLS
backbone.
B. EVPL is a multipoint service that emulates a LAN over an MPLS backbone.
C. EPLAN is a multipoint service that emulates a LAN over an MPLS backbone.
D. EVPL is a point-to-point service from one customer site to another across an MPLS backbone.
E. ELAN is a point-to-point service from one customer site to another across an MPLS backbone.
F. EVPL is a multipoint service with a root node that is suitable for multicast services.
Answer: A,B