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2021 Sep 400-101 ccie written passing score:
Q161. Which two statements about the default behavior of IS-IS are true? (Choose two.)
A. The default IS-IS router type is L1/L2.
B. The default IS-IS metric type is wide.
C. The default IS-IS interface circuit type is L1/L2.
D. By default, two IS-IS routers must use the same hello interval and hold timer in order to become neighbors.
Answer: A,C
Q162. DRAG DROP
Drag and drop the LACP elements on the left into the correct priority order in the hot-standby port-selection process on the right.
Answer:
Q163. DRAG DROP
Drag and drop the NAT operations on the left into the correct sequential order on the right.
Answer:
Q164. Which option describes the effect of the OSPF default-information originate always command?
A. It creates a stub area.
B. It configures the device to advertise a default route regardless of whether it exists in the routing table.
C. It configures the device to automatically redistribute a default route.
D. It adds a static default route to the device configuration.
Answer: B
Explanation:
default-information originate
To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command in router configuration mode. To disable this feature, use the no form of this command.
default-information originate [always] metric metric-value [ metric-type type-value ] [ route-map map-name ]
Syntax Description
always (Optional) Always advertises the default route regardless of whether the software has a default route.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-d2.html
Q165. Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration?
A. IS-IS does not protect from MTU mismatch.
B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected.
C. IS-IS uses path MTU discovery as specified in RFC 1063.
D. IS-IS uses padding of hello packets to full MTU.
Answer: D
Explanation:
Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html
Down to date cisco 400-101:
Q166. Which three values can be used to tag external EIGRP routes? (Choose three.)
A. The router ID of the router that redistributed the route
B. The administrative distance of the external protocol
C. The protocol ID of the external protocol
D. The cost to reach the router that redistributed the route
E. The metric from the external protocol F. The router ID of the router from which the external protocol route was learned
Answer: A,C,E
Explanation:
EIGRP has the notion of internal and external routes. Internal routes are ones that have been originated within an EIGRP autonomous system (AS). Therefore, a directly attached network that is configured to run EIGRP is considered an internal route and is propagated with this information throughout the EIGRP AS. External routes are ones that have been learned by another routing protocol or reside in the routing table as static routes. These routes are tagged individually with the identity of their origination. External routes are tagged with the following information:
The router ID of the EIGRP router that redistributed the route.
The AS number where the destination resides.
A configurable administrator tag.
Protocol ID of the external protocol.
The metric from the external protocol.
Bit flags for default routing.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13669-1.html#route_tagging
Q167. What happens when an interface is configured as passive in OSPF?
A. No OSPF neighbor ship is formed on the interface.
B. An OSPF neighbor ship is formed with the DR, but not with the BDR.
C. The subnet configured on the interface is not advertised to any other neighbor.
D. OSPF hello messages are sent as unicast instead of multicast.
Answer: A
Q168. Which two technologies are supported by EIGRP? (Choose two.)
A. clear-text authentication
B. MD5 authentication
C. stub routing
D. multiple areas
Answer: B,C
Explanation:
The IP Enhanced IGRP Route Authentication feature provides MD5 authentication of routing updates from the EIGRP routing protocol. The MD5 keyed digest in each EIGRP packet prevents the introduction of unauthorized or false routing messages from unapproved sources. The EIGRP stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Stub routing is commonly used in hub-and-spoke network topologies. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote device (the spoke) that is connected to one or more distribution devices (the hub). The remote device is adjacent to one or more distribution devices. The only route for IP traffic to reach the remote device is through a distribution device.
References: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-rte-auth.html http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-s/ire-15-s-book/ire-eigrp-stub-rtg.html
Q169. Which two statements about redistribution are true? (Choose two.)
A. EIGRP requires the route to have a default metric defined.
B. EIGRP and OSPF use their router IDs to prevent loops.
C. When OSPF is redistributed into IS-IS, the default metric must be configured under the IS-IS process.
D. When traffic is redistributed into OSPF, the subnets command is needed to redistribute classful subnets.
E. The default seed metric for OSPF redistributed routes is 30.
Answer: A,B
Q170. 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.