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Q61. Refer to the exhibit. The network setup is running the RIP routing protocol. Which two events will occur following link failure between R2 and R3? (Choose two.)
A. R2 will advertise network 192.168.2.0/27 with a hop count of 16 to R1.
B. R2 will not send any advertisements and will remove route 192.168.2.0/27 from its routing table.
C. R1 will reply to R2 with the advertisement for network 192.168.2.0/27 with a hop count of 16.
D. After communication fails and after the hold-down timer expires, R1 will remove the 192.168.2.0/27 route from its routing table.
E. R3 will not accept any further updates from R2, due to the split-horizon loop prevention mechanism.
Q62. An engineer has configured a router to use EUI-64, and was asked to document the IPv6 address of the router. The router has the following interface parameters:
mac address C601.420F.0007
Which IPv6 addresses should the engineer add to the documentation?
Explanation: Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-
Bit IP Version 6 interface identifier (EUI-64). This feature is a key benefit over IPv4 as it eliminates the
need of manual configuration or DHCP as in the world of IPv4. The IPv6 EUI-64 format address is obtained
through the 48-bit MAC address. The Mac address is first separated into two 24-bits, with one being OUI
(Organizationally Unique Identifier) and the other being NIC specific. The 16-bit 0xFFFE is then inserted
between these two 24-bits to for the 64-bit EUI address. IEEE has chosen FFFE as a reserved value which
can only appear in EUI-64 generated from the EUI-48 MAC address. Here is an example showing how the
Mac Address is used to generate EUI.
Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. This bit identifies
whether this interface identifier is universally or locally administered. If 0, the address is locally
administered and if 1, the address is globally unique. It is worth noticing that in the OUI portion, the globally
unique addresses assigned by the IEEE has always been set to 0 whereas the locally created addresses
has 1 configured. Therefore, when the bit is inverted, it maintains its original scope (global unique address
is still global unique and vice versa). The reason for inverting can be found in RFC4291 section 2.5.1.
Reference: https:// supportforums.cisco.com/document/100566/understanding-ipv6-eui-64-bit- address
Q63. Which statement about the NPTv6 protocol is true?
A. It is used to translate IPv4 prefixes to IPv6 prefixes.
B. It is used to translate an IPv6 address prefix to another IPv6 prefix.
C. It is used to translate IPv6 prefixes to IPv4 subnets with appropriate masks.
D. It is used to translate IPv4 addresses to IPv6 link-local addresses.
Q64. Which IPv6 address type is seen as the next-hop address in the output of the show ipv6 rip RIPng database command?
Q65. A network engineer is asked to configure a "site-to-site" IPsec VPN tunnel. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ip nat inside source list 1 int s0/0 overload. Which functions do the two commands serve in this scenario?
A. The command access-list 1 defines interesting traffic that is allowed through the tunnel.
B. The command ip nat inside source list 1 int s0/0 overload disables "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface.
C. The command access-list 1 permit any defines only one machine that is allowed through the tunnel.
D. The command ip nat inside source list 1 int s0/0 overload provides "many-to-one" access for all devices on a defined segment to share a single IP address upon exiting the external interface.
Configuring NAT to Allow Internal Users to Access the Internet Using Overloading NAT Router
interface ethernet 0
ip address 10.10.10.1 255.255.255.0
ip nat inside
!--- Defines Ethernet 0 with an IP address and as a NAT inside interface.
interface ethernet 1
ip address 10.10.20.1 255.255.255.0
ip nat inside
!--- Defines Ethernet 1 with an IP address and as a NAT inside interface.
interface serial 0
ip address 172.16.10.64 255.255.255.0
ip nat outside
!--- Defines serial 0 with an IP address and as a NAT outside interface.
ip nat pool ovrld 172.16.10.1 172.16.10.1 prefix 24 !
!--- Defines a NAT pool named ovrld with a range of a single IP
!--- address, 172.16.10.1.
ip nat inside source list 7 pool ovrld overload
!--- Indicates that any packets received on the inside interface that
!--- are permitted by access-list 7 has the source
!--- translated to an address out of the NAT pool named ovrld.
!--- Translations are overloaded, which allows multiple inside
!--- devices to be translated to the same valid IP
access-list 7 permit 10.10.10.0 0.0.0.31
access-list 7 permit 10.10.20.0 0.0.0.31
!--- Access-list 7 permits packets with source addresses ranging from
!--- 10.10.10.0 through 10.10.10.31 and 10.10.20.0
Note in the previous second configuration, the NAT pool "ovrld"only has a range of one address. The
keyword overload used in the ip nat inside source list 7 pool
ovrld overload command allows NAT to translate multiple inside devices to the single address in the pool.
Q66. What are the three modes of Unicast Reverse Path Forwarding?
A. strict mode, loose mode, and VRF mode
B. strict mode, loose mode, and broadcast mode
C. strict mode, broadcast mode, and VRF mode
D. broadcast mode, loose mode, and VRF mode
Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit
the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the
reachability of the source address in packets being forwarded. This capability can limit the appearance of
spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast
RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all
network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this
document. When administrators use Unicast RPF in strict mode, the packet must be received on the
interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may
drop legitimate traffic that is received on an interface that was not the router's choice for sending return
traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the
network. When administrators use Unicast RPF in loose mode, the source address must appear in the
routing table. Administrators can change this behavior using the allow-default option, which allows the use
of the default route in the source verification process. Additionally, a packet that contains a source address
for which the return route points to the Null 0 interface will be dropped. An access list may also be
specified that permits or denies certain source addresses in Unicast RPF loose mode. Care must be taken
to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of
this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern
when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain
asymmetric routing paths. Reference: http://www.cisco.com/web/about/security/intelligence/unicastrpf.