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Q1. Consider a network that mixes link bandwidths from 128 kb/s to 40 Gb/s. Which value should be set for the OSPF reference bandwidth?
A. Set a value of 128.
B. Set a value of 40000.
C. Set a manual OSPF cost on each interface.
D. Use the default value.
E. Set a value of 40000000.
F. Set a value of 65535.
Answer: C
Explanation:
Unlike the metric in RIP which is determined by hop count and EIGRP’s crazy mathematical formulated metric, OSPF is a little more simple. The default formula to calculate the cost for the OSPF metric is (10^8/BW). By default the metrics reference cost is 100Mbps, so any link that is 100Mbps will have a metric of 1. a T1 interface will have a metric of 64 so in this case if a router is trying to get to a FastEthernet network on a router that is through a T1 the metric would be 65 (64 +1). You do however have the ability to statically specify a metric on a per interface basis by using the ip ospf cost # where the cost is an integer between 1-65535.
So the big question is why would you want to statically configure a metric? The biggest advantage of statically configuring an OSPF metric on an interface is to manipulate which route will be chosen dynamically via OSPF. In a nut shell it’s like statically configuring a dynamic protocol to use a specific route. It should also be used when the interface bandwidths vary greatly (some very low bandwidth interfaces and some very high speed interfaces on the same router).
Q2. Which three fields are part of a TCN BPDU? (Choose three.)
A. protocol ID
B. version
C. type
D. max-age
E. flags
F. message age
Answer: A,B,C
Q3. Which two tunneling techniques determine the IPv4 destination address on a per-packet basis? (Choose two.)
A. 6to4 tunneling
B. ISATAP tunneling
C. manual tunneling
D. GRE tunneling
Answer: A,B
Explanation: Tunnel Configuration Parameters by Tunneling Type
Tunneling Type
Tunnel Configuration Parameter
Tunnel Mode
Tunnel Source
Tunnel Destination
Interface Prefix or Address
Manual
ipv6ip
An IPv4 address, or a reference to an interface on which IPv4 is configured.
An IPv4 address.
An IPv6 address.
GRE/IPv4
gre ip
An IPv4 address.
An IPv6 address.
IPv4-compatible
ipv6ip auto-tunnel
Not required. These are all point-to-multipoint tunneling types. The IPv4 destination address is calculated, on a per-packet basis, from the IPv6 destination.
Not required. The interface address is generated as ::tunnel-source/96.
6to4
ipv6ip 6to4
An IPv6 address. The prefix must embed the tunnel source IPv4 address
ISATAP
ipv6ip isatap
An IPv6 prefix in modified eui-64 format. The IPv6 address is generated from the prefix and the tunnel source IPv4 address.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-tunnel.html
Q4. Which statement about OSPF loop prevention is true?
A. The discard route is generated automatically on the ABR to prevent routing loops.
B. The ASBR uses type 3 LSAs from non-backbone areas to prevent control-plane routing loops.
C. The ABR can filter type 3 LSPs to prevent routing loops.
D. The DN bit ignores LSA types 2, 3, and 5 to prevent routing loops.
Answer: A
Q5. How does MSTP provide backward compatibility with RSTP?
A. It uses the hop count variable as a TTL counter.
B. It transmits all spanning-tree information in one BPDU.
C. It supports up to 128 MSTI messages.
D. It encodes the MSTP-specific region information before the legacy RSTP BPDU.
Answer: D
Q6. Which two statements about LDP advertising when Explicit Null is in effect are true? (Choose two.)
A. Penultimate hop popping is disabled.
B. Penultimate hop popping is enabled.
C. It is the default behavior for LDP.
D. It is used for the advertisement of static routes.
E. It is used for the advertisement of connected routes.
Answer: A,E
Q7. Which statement about the RPF interface in a BIDIR-PIM network is true?
A. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the PIM rendezvous point.
B. In a BIDIR-PIM network, the RPF interface can be the interface that is used to reach the PIM rendezvous point or the interface that is used to reach the source.
C. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the source.
D. There is no RPF interface concept in BIDIR-PIM networks.
Answer: A
Explanation:
RPF stands for "Reverse Path Forwarding". The RPF Interface of a router with respect to an address is the interface that the MRIB indicates should be used to reach that address. In the case of a BIDIR-PIM multicast group, the RPF interface is determined by looking up the Rendezvous Point Address in the MRIB. The RPF information determines the interface of the router that would be used to send packets towards the Rendezvous Point Link for the group.
Reference: https://tools.ietf.org/html/rfc5015
Q8. Assume that the following MAC addresses are used for the bridge ID MAC address by four different switches in a network. Which switch will be elected as the spanning-tree root bridge?
A. SwitchA uses MAC 1000.AA-AA-AA-AA-AA-AA.
B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB.
C. SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC.
D. SwitchD uses MAC 4000.DD-DD-DD-DD-DD-DD.
Answer: A
Explanation:
The switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority (32768), the switch with the lowest MAC address in the VLAN becomes the root switch.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swstp.html
Q9. Refer to the exhibit.
Which route type is displayed when you enter the command show ip route supernets-only on a device with this configuration?
A. Connected
B. OSPF
C. RIP
D. EIGRP
E. An empty route set
Answer: E
Explanation:
This command shows supernets only; it does not show subnets. In this case, the routing table would contain the 10.0.0.0/24 subnet, but not the 10.0.0.0/8 supernet.
Q10. DRAG DROP
Drag and drop each GET VPN feature on the left to the corresponding function it performs on the right.
Answer: