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Q5
Which two kinds of routers can establish adjacencies with a Level 1 IS? (Select two)A. Any Level-1 IS in any area.B. Any Level-2 IS in any area.C. Any Level-1 IS in the same area.D. Any Level-2 IS in the same area.E. Any Level-1/Level-2 IS in the same area.
Ans: C, E
Explanation: Level 1 routers are inside and so, it can access only level 1 routers in the same
area or the L1/L2 routers in the same area.
Q6
Which IOS command displays the Level-1 routing table in Integrated IS-IS?A. show isis routeB. show clns routeC. show isis databaseD. show clns neighbors
Ans: A
Explanation:
show isis route - Displays the IS-IS Level 1 forwarding table for IS-IS-learned
routes
Q7
By which command could you view he Level-2 routing table in Integrated IS-IS?A. show isis databaseB. show clns trafficC. show ip routeD. show clns route
Ans: A
Explanation:
The show isis database (detail) command displays the contents of the IS-IS database. Below is
the output of this command when issued on R2. Since IS-IS is a link state protocol, the link state
database should be the same for any router in the same area.
Reference:
http://www.cisco.com/en/US/tech/ CK3 65/ CK3 81/technologies_configuration_example09186a0080
093f38.shtml
Q8
One of the characteristics of the routing protocol IS-IS is its ability to use level-1 routing.
Where in a network does this happen?A. Between domains.B. Between areas.C. Between intermediate systems in the same area.D. Between end systems and intermediate systems in the same area.
Ans: C
Explanation:
A two-level hierarchy is used to support large routing domains. A large domain may be
administratively divided into areas. Each system resides in exactly one area.1 Routing within an
area is referred to as Level 1 routing. Routing between areas is referred to as Level 2 routing.
A Level 2 Intermediate System (IS) keeps track of the paths to destination areas. A Level 1 IS
keeps track of the routing within its own area. For a packet destined for another area, a Level 1
IS sends the packet to the nearest Level 2 IS in its own area, regardless of what the destination
area is. Then the packet travels via Level 2 routing to the destination area, where it may travel
via Level 1 routing to the destination. It should be noted that selecting an exit from an area based
on Level 1 routing to the closest Level 2 IS might result in suboptimal routing.2
Reference:
http://www.cisco.com/en/US/tech/ CK3 65/ CK3 81/technologies_white_paper09186a00800a3e6f.sht
ml
Q9
Your newly appointed CertKing trainee wants to know why Level-3 area routing is not a
supported feature of integrated IS-IS on Cisco routers.
What will your reply be?A. The system ID on a Cisco router is limited to 6 bytes.B. The NET on a Cisco router is restricted to a maximum of 8 bytes.C. The lack of a Domain portion of the NSAP only accommodates for 2 levels of routing
hierarchy.D. Cisco routers cannot route CLNS data that use the ISO/IEC 10589 standard of NSAP
addressing.E. Since the NSAP service identifier (N-SEL) must always be set to 00, no other service
types are available.
Ans: C
Explanation:
Integrated IS-IS is a version of the OSI IS-IS routing protocol that uses a single routing
algorithm to support more network layer protocols than just CLNP. Integrated IS-IS sometimes
is called Dual IS-IS, named after a version designed for IP and CLNP networks. Only one IS-IS
process is allowed whether you run it in integrated mode, ISO CLNS only or IP only.
Q0
With which of the following routers can a Level-1/Level-2 IS establish an adjacency?
(Choose four)A. Any Level-1 IS in any area.B. Any Level-2 IS in any area.C. Any Level-1 IS in the same area.D. Any Level-1/Level-2 IS in any area.E. Any Level-1/Level-2 IS in the same area
Ans: B, C, D, E
Explanation:
A-Incorrect because a Level-1 IS router can only form adjacency with routers within the same
area.
All other choices are right.
Section 14: Describe the concept of establishing adjacencies (2 Questions)
Q 1
With which of the following routers can a Level-1 IS-IS router establish an adjacency with?
(Select two)A. Any Level-1 IS in any area.B. Any Level-2 IS in any area.C. Any Level-1 IS in the same area.D. Any Level-2 IS in the same area.E. Any Level-1/Level-2 IS in the same area.
Ans: C, E
Explanation: A Level-1 IS router can establish adjacencies with other routers Level-1 and
Level-1/Level-2 IS routers within the same area.
Incorrect Anss
A: Level-1 adjacencies can only be established within one single area.
B, D: Level-2 adjacencies require Level-2 IS routers.
Q2
With which of the following routers can a Level-1 / Level-2 IS-IS router establish an
adjacency with? (Select two)A. Any Level-1 IS in any area.B. Any Level-2 IS in any area.C. Any Level-1 IS in the same area.D. Any Level-1/Level-2 IS in any area.E. Any Level-1/Level-2 IS in the same area.
Ans: B, C, D, E
Explanation: A Level-1/Level-2 IS routers can establish adjacencies with Level-1 in the same
area, and with Level-1/Level-2 IS or Level 2 IS routers in any area.
Incorrect Anss
A: Level 1 IS routers can only form adjacencies with routers within the same area.
Reference: Introduction to Intermediate System-to-Intermediate System Protocol
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/insys_wp.htm
Section 15: Describe the features and operation of BGP (21 questions)
Q
Which three of the statements below correctly describe the characteristics of Autonomous
Systems in BGP networks? (Select three)A. Within an AS, all routers must run either BGP or IBGP.B. An AS uses exterior gateway protocols (EGPs) to exchange information with other
autonomous systems.C. An AS is a group of routers under the same technical administration.D. Within an AS, routes learned through BGP can be redistributed using interior gateway
protocols.E. Within an AS, routers learned through an interior protocol cannot be redistributed using
BGP to other autonomous systems.
Ans: B C D
Explanation:
o Exterior Gateway Protocol (EGP) routing protocol used to connect between
autonomous systems.
o The use of the term autonomous system in connection with BGP stresses the fact that the
administration of an autonomous system appears to other autonomous systems to have a
single coherent interior routing plan, and presents a consistent picture of those networks
that are reachable through it.
o BGP is used between autonomous systems
Reference: Building Scalable Cisco Networks (Ciscopress) page 313
Q2
Exhibit
On the assumption that there is no IGP running in AS 64700 and synchronization is OFF,
which router in AS 64700 is going to advertise the route to 183.32.0.0?A. CK2 onlyB. CK5 onlyC. CK2 and CK5 onlyD. CK2 , CK3 , and CK4 onlyE. CK2 , CK3 , CK4 , and CK5
Ans: E
Explanation: We need to run IGP on AS 64700 to control the exit points from the AS. All
routers in AS 64700 will advertise the route.
Reference: Using the Border Gateway Protocol for Interdomain Routing
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm
Q3
Which of the following statements about IBGP routers are true?A. They must be fully meshed.B. They can be in a different AS.C. They must be directly connected.D. They do not need to be directly connected.
Ans: D
Explanation: The IBGP routers need not be directly connected.
Q4
What kind of IBGP router advertises routes to other IGRP neighbors?A. clientB. EBGP peerC. route reflectorD. cluster of clients
Ans: C
Explanation: Ordinarily, with no route reflector, a full mesh of IBGP peers is required. Route
reflectors modify the BGP split horizon rule by allowing the router configured as the route
reflector to propagate routes learned by IBGP to other IBGP peers. Route reflectors reduce the
number of BGP neighbor relationships in an AS.
Q5
The BGP routing process relies on two different types of tables. What are they? (Select
two)A. An IP routing table.B. A BGP topology table.C. A BGP attribute table.D. A table that contains BGP information received from and sent to other routers.E. A combined table that contains both IP routes and BGP information received from and
sent to other routers.
Ans: B, C
Explanation:
BGP uses one table for topology and another for attribute. The attribute table assigns values to
various attributes (weight, local preference, mult-exit discriminator, origin, AS path, next hop, &
community) and the topology table matches the values of these attributes to the various routes it
can select.
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