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Free Ericsson ECP-206 Exam Questions (page: 7)

Page 3 of 16
PDF with 60 Questions

Within an IGP area, which two statements are correct? (Choose two.)

  1. Routers summarize information they learn from neighbors.
  2. Routers discard valid but inaccurate information from neighbors.
  3. Routers advertise information about themselves.
  4. Routers relay information delivered by neighbors.

Answer(s): C,D

Explanation:

Within an IGP area, routers advertise information about themselves and relay information delivered by neighbors. This is how link-state routing protocols such as OSPF and IS-IS work. They flood information about the network topology to all routers in the same area or domain. That information is then used to build a complete network connectivity map and to calculate the shortest path to destinations. Routers do not summarize or discard information within an area, unless they are configured to do so by some filtering mechanism.


Reference:

Ericsson IP Networking - Routing Protocols, IP Routing: ISIS Configuration Guide - IS-IS Overview and Basic Configuration



Which network is reserved as a private network according to RFC1918?

  1. 172.16.1.0/9
  2. 10.254.1.0/24
  3. 193.168.1.0/24
  4. 172.15.1.0/24

Answer(s): B

Explanation:

According to RFC1918, there are three network blocks reserved as private networks that are not allocated to any specific organization and are not routable on the public Internet. These are:
10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
Out of these, only option B (10.254.1.0/24) falls within one of the private network blocks (10.0.0.0/8). Option A (172.16.1.0/9) is not valid because it exceeds the /12 prefix length of the private network block (172.16.0.0/12). Option C (193.168.1.0/24) is not valid because it does not belong to any of the private network blocks, and is actually assigned to RIPE NCC as a public network block . Option D (172.15.1.0/24) is also not valid because it does not belong to any of the private network blocks, and is actually assigned to ARIN as a public network block .


Reference:

RFC 1918:

Address Allocation for Private Internets, Private network - Wikipedia, [RIPE NCC IPv4 Address Space Chart], [ARIN WHOIS Database Search]



Which action will influence BGP route selection within your AS?

  1. reducing number of hops in the network
  2. changing the default value of the local preference
  3. changing the default link metric
  4. changing the administrative distance for eBGP

Answer(s): B

Explanation:

The action that will influence BGP route selection within your AS is changing the default value of the local preference attribute. The local preference attribute is used to indicate the preference of a path among multiple paths learned from different external BGP neighbors or autonomous systems (ASes). The higher the local preference value, the more preferred the path is within your AS, and vice versa. The default value of local preference is 100, but you can change it using route maps or other configuration methods on your BGP routers.


Reference:

Ericsson IP Networking - Routing Protocols, BGP Attributes and Path Selection, BGP Local Preference Attribute: Controlling Traffic Like a Pro



Which statement is true about LDP?

  1. LDP and IGP both exchange their databases every 60 seconds.
  2. LDP and IGP both exchange their databases every 30 seconds.
  3. LDP relies on IGP for all routing-related decisions.
  4. LDP performs routing functions along with IGP.

Answer(s): C

Explanation:

LDP relies on IGP for all routing-related decisions. LDP is a protocol that distributes labels in an MPLS environment, but it does not perform any routing functions. LDP uses the underlying routing information provided by an IGP, such as OSPF or IS-IS, to forward label packets. LDP and IGP do not exchange their databases at regular intervals, but rather use hello messages to maintain adjacencies and sessions.


Reference:

Ericsson IP Networking - Routing Protocols, Label Distribution Protocol - Wikipedia



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