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Q1. Refer to the exhibit.
Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit?
A. Router R2 will not form a neighbor relationship with R1.
B. Router R2 will obtain a full routing table, including a default route, from R1.
C. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.
D. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1.
Answer: A
Explanation:
Open Shortest Path First http://en.wikipedia.org/wiki/Open_Shortest_Path_First
The configuration of R1 shows "router ospf 1" however, the diagram also shows that both routers should be in the backbone OSPF Area of "0". When routers are in different OSPF areas they will not form a neighbor relationship.
Neighbor relationships
As a link state routing protocol, OSPF establishes and maintains neighbor relationships in order to exchange routing updates with other routers. The neighbor relationship table is
called an adjacency database in OSPF.
Provided that OSPF is configured correctly, OSPF forms neighbor relationships only with the routers directly connected to it. In order to form a neighbor relationship between two routers, the interfaces used to form the relationship must be in the same area. Generally an interface is only configured in a single area, however you can configure an interface to belong to multiple areas. In the second area, such an interface must be configured as a secondary interface. (A neighbor state simulation shows how neighbor state changes from Down to Full Adjacency progressively with exchanging Hello, DD, Request, Update, and Ack packets).
Q2. Which term describes a spanning-tree network that has all switch ports in either the blocking or fowarding state?
A. converged
B. redundant
C. provisioned
D. spanned
Answer: A
Explanation:
Spanning Tree Protocol convergence (Layer 2 convergence) happens when bridges and switches have transitioned to either the forwarding or blocking state. When layer 2 is converged, root bridge is elected and all port roles (Root, Designated and Non-Designated) in all switches are selected.
Q3. Which statement about the IP SLAs ICMP Echo operation is true?
A. It is configured in enable mode.
B. It is used to determine the one-way delay between devices.
C. It is used to identify the best source interface from which to send traffic to a destination.
D. The frequency of the operation is specified in milliseconds.
Answer: C
Q4. Which purpose of the network command in OSPF configuration mode is true?
A. It defines a wildcard mask to identify the size of the network.
B. It defines the area ID.
C. It defines the network by its classful entry.
D. It defines which networks are used for virtual links.
Answer: A
Q5. What is the minimum command to turn on encryption on SNMP?
A. SNMPV3authpriv
B. SMNPV3authnopriv
C. SNMPV3noauthpriv
D. SMNPV2authnopriv
E. SNMPV2NOAUTHPRIV
F. SNMPV2AUTHNOPRIV
Answer: A
Q6. Refer to the exhibit.
Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1?
A. The router will forward packets from R3 to R2 to R1.
B. The router will forward packets from R3 to R1 to R2.
C. The router will forward packets from R3 to R2 to R1 AND from R3 to R1.
D. The router will forward packets from R3 to R1.
Answer: C
Explanation:
From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal- cost paths (192.168.10.9 &192.168.10.5) - traffic to this network will be load-balanced.
Q7. Which WAN solution is secured by default?
A. VPN
B. DSL
C. LCP
D. PPP
Answer: A
Q8. What are two benefits of using a single OSPF area network design? (Choose two.)
A. It is less CPU intensive for routers in the single area.
B. It reduces the types of LSAs that are generated.
C. It removes the need for virtual links.
D. It increases LSA response times.
E. It reduces the number of required OSPF neighbor adjacencies.
Answer: B,C
Explanation:
OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows:
u2711 LSA Type 1: Router LSA
u2711 LSA Type 2: Network LSA
u2711 LSA Type 3: Summary LSA
u2711 LSA Type 4: Summary ASBR LSA
u2711 LSA Type 5: Autonomous system external LSA
u2711 LSA Type 6: Multicast OSPF LSA
u2711 LSA Type 7: Not-so-stubby area LSA
u2711 LSA Type 8: External attribute LSA for BGP
If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router.
All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non- backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed.
Q9. If primary and secondary root switches with priority 16384 both experience catastrophic losses, which tertiary
switch can take over?
A. a switch with priority 20480
B. a switch with priority 8192
C. a switch with priority 4096
D. a switch with priority 12288
Answer: A
Q10. Refer to the exhibit
While you troubleshoot a connectivity issue to a PC behind R1, you enter the show access- lists command to generate this output. Which reason for the problem is most likely true?
A. The permit all ACL entry on R1 is inactive.
B. The ACL of R1 is misconfigured.
C. A deny all ACL entry is currently active on R1.
D. An implicit deny is causing R1 to block network traffic.
Answer: D
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